Answer:
25
Step-by-step explanation:
First, plug -5 in for a, -(-5)^2. We treat the negative on the outside of the paranthese as a -1 so we do -1 times -5 and we get 5. Then we square 5 and get 25.
Please help me
If you spin the spinner shown, what is probability of landing on red?
favorableoutcomes
——————————-
possibleoutcomes
Write your response...
Answer:
1/4 or 25%
Step-by-step explanation:
Theres a 1/4 chance of it landing on red.
Answer:
they be correct
Step-by-step explanation:
Meteorologists are interested in the relationship between minimum pressure and maximum wind speed of hurricanes. The minimum pressure, in millibars, and maximum wind speed, in knots, were collected for a random sample of 100 hurricanes from the year 1995 to the year 2012. A regression analysis of maximum wind speed on minimum wind pressure produced a 95 percent confidence interval of (-1.42, -1.20) for the slope of the least-squares regression line. Which statement is a correct interpretation of the interval?
Answer:
We can be 95% confident that wind speed decreases, on average, between 1.20 knots and 1.42 knots for each millibar increase in minimum pressure.
Step-by-step explanation:
The computed confidence interval for a certain statistical parameter gives a range of value represented by a minimum value and a maximum value. The α value upon which the value was calculated represents the probability of the estimated value containing the true value of the parameter in question.
The minimum and maximum values represents the range of possible slope parameters, the true value falls in between two negative values, thus we have a negative slope, depicting a decline in one variable and the as the other increases.
From the options above, the most appropriate option is ;
We can be 95% confident that wind speed decreases, on average, between 1.20 knots and 1.42 knots for each millibar increase in minimum pressure.
Describe what you normally do on Sunday
my normal routine except i go to church
Joses his yearly wages were $50 more than marks, so he earned 16,815.43. Yet he said his taxes are the same as marks. Is he right? How can you tell?
Answer:
No
Step-by-step explanation:
This depends on many other things but in a basic tax bracket, both Joses and Mark both fall under the 12% tax bracket. This is for individuals who make a yearly salary between $9,876 to $40,125, in which the taxes would be 12% of the yearly salary. Since this is percent based, their taxes would not be the same, they would be close but Mark would still end up paying a little bit more since he made more money.
In Problems 10 and 11, a sequence is defined recursively. Write down the first five terms.
10. a1=3; an=4-an-1
11. a1=1; a2=2; an=-1 *an-2
Step-by-step explanation:
10. a1=3, a2=1, a3=3, a4=1, a5=3
11. a3=2x1=2, a4=2x2=4, a5=4x2=8
hope that helps :)
Lynn is trying to determine how far away Student B is from the balloon. He decides to use the
equation shown below. Is his equation correct? Why or why not?
5
cos 60º =
BIV x
Answer:
See Explanation
Step-by-step explanation:
The question is incomplete as the image that illustrates the scenario is not given.
However, I can deduce that the question is about a right-angled triangle.
So, I will give a general explanation on how to find each of the side of the triangle, given a side and an angle.
For triangle A (solve for b)
Using cosine formula.
[tex]\cos \theta = \frac{Adjacent}{Hypotenuse}[/tex]
[tex]\cos 60= \frac{5}{b}[/tex]
Make b the subject
[tex]b= \frac{5}{\cos 60}[/tex]
For triangle B (solve for b)
Using cosine formula.
[tex]\sin \theta = \frac{Opposite}{Hypotenuse}[/tex]
[tex]\sin 60= \frac{b}{5}[/tex]
Make b the subject
[tex]b = 5\sin 60[/tex]
For triangle C (solve for b)
Using cosine formula.
[tex]\tan \theta = \frac{Opposite}{Adjacent}[/tex]
[tex]\tan 60= \frac{b}{5}[/tex]
Make b the subject
[tex]b = 5\tan 60[/tex]
Answer:
Did you get the answer If so please give it to me.
Step-by-step explanation:
I'm stuck. plz help I dont know how
Answer:
1) regular price ⇒ $X
Sale price:75,24
Regular price: 100, X
2) The Ratio of the numbers in the first column equals the to ratio
of numbers in the second one
so.. [tex]\frac{75}{124}=\frac{100}{x} \\[/tex]
X=100 ×24/75
X=$32
Regular price-sale price=32-24=$8
hope it helps...
What is the solution to the system of equations?
-6x-2y = 8
1
X+ 3y = 29
O (10,-2)
O (10, 2)
O (2, 10)
O (-2, 10)
Step-by-step explanation:
-2,10 is the answer according to my working
A formula of order 4 for approximating the first derivative of a function f gives: f'(0) -4.50557 for h = 1 f'(0) 2.09702 for h = 0.5 By using Richardson's extrapolation on the above values, a better
Using Richardson's extrapolation the improved approximation of the first derivative at x = 0 is -4.94543.
A formula of order 4 for approximating the first derivative of a function f gives two values: f'(0) = -4.50557 for h = 1 and f'(0) = 2.09702 for h = 0.5.
To obtain a better approximation using Richardson's extrapolation, we can use these two values and apply the following formula:
f'(0) = f'(0) + (f'(0) - f'(0)) / (h^p - 1)
where p is the order of the formula (in this case, p = 4).
Using the given values, we have:
f'(0) = 2.09702 + (2.09702 - (-4.50557)) / ((0.5/1)^4 - 1)
Simplifying the expression:
f'(0) = 2.09702 + 6.60259 / (0.0625 - 1)
f'(0) = 2.09702 + 6.60259 / (-0.9375)
f'(0) = 2.09702 - 7.04245
f'(0) ≈ -4.94543
Therefore, the improved approximation of the first derivative at x = 0 using Richardson's extrapolation is f'(0) ≈ -4.94543.
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Help plssssss I need it I’m failing life like uhhhhhh
Answer:
164
Step-by-step explanation:
15(5)
2(7)
15(5)
add em up
75 plus 14 plus 75
QUICK! WHOEVER GIVES CORRECT ANSWER GETS BRAINLIEST
Answer:
15
Step-by-step explanation:
Answer:
15 cookies
Step-by-step explanation:
10 cookies is equivalent to 2 scoops of flour.
You need to find how many cookies they can make with just 1 scoop of flour.
So, to do that, you'd need to do 10/2, which is 5.
10 represents the number of cookies, and 2 represents the scoops of flour. (5 represents the number of cookies you can make with 1 scoop of flour.)
This will work with any certain amount of flour, just use the equation 5 times X, where X is the amount of flour.
In this certain problem, they gave us the scoops of flour.
Replace X with 3.
3 times 5 = 15.
15 cookies.
For the following linear operators T: R2→R2
T(x, y)=(3x+3y, x+5y)
Find:
Subtask (1). All eigenvalues and a basis for each eigenspace.
Subtask (2). A basis for each eigenspace.
Subtask (3). Find a maximum set S of linearly independent eigenvectors of T.
Subtask (4). Is T diagonalizable? If yes, find P such that D=P-1[T]P is diagonal the diagonal representation of a matrix representation of T. Here [T] is the matrix representation of T in usual basis.
T is diagonalizable, and the matrix P = [(1, -3), (1, 1)] is the transformation matrix that diagonalizes T. The diagonal matrix D is D = [(7.5, 22.5), (2.5, 7.5)].
To find the eigenvalues and eigenvectors of the linear operator T: R2 → R2 given by T(x, y) = (3x + 3y, x + 5y), we can follow the steps outlined in the subtasks.
Subtask (1): Finding Eigenvalues and Eigenvectors
To find the eigenvalues, we need to solve the equation (T - λI)v = 0, where λ is the eigenvalue, I is the identity matrix, and v is the eigenvector.
Let's set up the equation:
(T - λI)v = 0
[(3x + 3y) - λx, (x + 5y) - λy] = [0, 0]
Expanding the equations, we get:
(3 - λ)x + 3y = 0 ...(1)
x + (5 - λ)y = 0 ...(2)
For nontrivial solutions (v ≠ 0), the determinant of the coefficient matrix must be zero. So we have:
[tex](3 - \lambda)(5 - \lambda) - 3 = 0\\(15 - 8 \lambda + \lambda^2) - 3 = 0\\ \lambda^2 - 8 \lambda+ 12 = 0\\( \lambda - 6)( \lambda - 2) = 0[/tex]
Solving for λ, we find two eigenvalues:
λ1 = 6 and λ2 = 2
For each eigenvalue, we need to find the corresponding eigenvectors by substituting back into equations (1) and (2).
For λ1 = 6:
From equation (1): (3 - 6)x + 3y = 0
-3x + 3y = 0
x = y
So, the eigenvector corresponding to λ1 = 6 is v1 = (1, 1).
For λ2 = 2:
From equation (1): (3 - 2)x + 3y = 0
x + 3y = 0
x = -3y
So, the eigenvector corresponding to λ2 = 2 is v2 = (-3, 1).
Subtask (2): Basis for Each Eigenspace
The eigenspace corresponding to an eigenvalue λ is the set of all eigenvectors associated with that eigenvalue. To find a basis for each eigenspace, we can take linearly independent eigenvectors.
For λ1 = 6, the eigenspace is spanned by the eigenvector v1 = (1, 1).
For λ2 = 2, the eigenspace is spanned by the eigenvector v2 = (-3, 1).
Subtask (3): Maximum Set of Linearly Independent Eigenvectors
The maximum set S of linearly independent eigenvectors can be formed by taking one eigenvector from each distinct eigenvalue. In this case, S = {v1, v2} = {(1, 1), (-3, 1)}.
Subtask (4): Diagonalizability
To check if T is diagonalizable, we need to determine if there exists a basis for R2 consisting of eigenvectors of T. If we can find a basis consisting of eigenvectors, then T is diagonalizable.
Since we have a maximum set of linearly independent eigenvectors, S = {(1, 1), (-3, 1)}, we can form a matrix P with these eigenvectors as columns:
P = [(1, -3), (1, 1)]
To find the diagonal matrix D, we use the formula D = P^(-1)[T]P, where [T] is the matrix representation of T in the usual basis.
Calculating P^(-1):
P^(-1) = 1/4 [(1, 3), (-1, 1)]
Now, calculating D:
D = P^(-1)[T]P
= 1/4 [(1, 3), (-1, 1)][(3, 3), (1, 5)][(1, -3), (1, 1)]
= 1/4 [(1, 3), (-1, 1)][(6, 18), (8, 28)]
= 1/4 [(1, 3), (-1, 1)][(6, 18), (8, 28)]
= 1/4 [(30, 90), (10, 30)]
= [(7.5, 22.5), (2.5, 7.5)]
So, the matrix representation of T, [T], in the basis of eigenvectors is D = [(7.5, 22.5), (2.5, 7.5)].
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With the values of sin 30°, cos 30°, sin 60° and cos 60°
Charlie’s Wholesale Fruit Company, located in McAllen, Texas, is considering the purchase of a new fleet of trucks to be used in the delivery of fruits and vegetables grown in the Rio Grande Valley of Texas. If the company goes through with the purchase, it will spend $350,000 on eight rigs and $50,000 on the shipping cost. The new trucks will be kept for five years, during which time they will be depreciated toward a $40,000 salvage value using straight-line depreciation. The rigs are expected to have a market value in five years equal to $30,000. The new trucks will be used to replace the company’s older fleet of eight trucks, which are fully depreciated without any salvage value but can be sold for an estimated $20,000 today. The existing truck fleet is expected to be usable for five more years, after which time the rigs will have market value of $1,000. The existing fleet of trucks uses $250,000 per year in diesel fuel, whereas the new, more efficient fleet will use only $150,000. In addition, the new fleet will be covered under warranty, so the maintenance cost per year are expected to be only $10,000 compared to $35,000 for the existing fleet. Those changes in operating activities will have decrease the company’s requirement on net operating working capital as much as $20,000. The company’s current revenue is $800,000 and projected to grow at 10% per annum for the next five years. Cost of goods sold is always 50% of the company’s revenue. A $50,000 annual fixed operating expense (excluding fleet related costs) will remain the same for the next five years. The company has none fixed assets except for the fleet. The company faces a marginal tax rate of 30%. a. Calculate the replacement free cash flows generated by this proposed project! b. Calculate the Payback Period of this proposed project! c. If Charlie requires a 15% discount rate for the new investments, calculate the NPV and Profitability Index of this proposed project! d. Calculate the IRR of this proposed project! e. Based on your answer on b, c, and d, should the fleet be replaced? Why?
a. The replacement free cash flows is $255,000
b. The Payback Period time required to recover the initial investment is 2.7778 years.
d. By calculating the NPV at various discount rates, we can determine the rate at which NPV is closest to zero.
a. To calculate the replacement free cash flows, we need to consider the cash flows associated with the new fleet of trucks. Here's the calculation:
Initial cash outflow: Purchase cost of new trucks + Shipping cost
= $350,000 + $50,000
= $400,000
Annual cash flows:
Operating cost savings:
Diesel fuel savings: $250,000 - $150,000 = $100,000
Maintenance cost savings: $35,000 - $10,000 = $25,000
Net operating working capital reduction: $20,000
Total operating cost savings per year: $100,000 + $25,000 + $20,000 = $145,000
Revenue increase:
Revenue growth rate: 10%
Year 1 revenue increase: $800,000 * 10% = $80,000
Year 2 revenue increase: $800,000 * 10% = $80,000
Year 3 revenue increase: $800,000 * 10% = $80,000
Year 4 revenue increase: $800,000 * 10% = $80,000
Year 5 revenue increase: $800,000 * 10% = $80,000
Salvage value: Market value of the new trucks at the end of 5 years = $30,000
Free cash flows:
Year 0: Initial cash outflow = -$400,000
Year 1: Cash flow = Operating cost savings + Revenue increase = $145,000 + $80,000 = $225,000
Year 2: Cash flow = Operating cost savings + Revenue increase = $145,000 + $80,000 = $225,000
Year 3: Cash flow = Operating cost savings + Revenue increase = $145,000 + $80,000 = $225,000
Year 4: Cash flow = Operating cost savings + Revenue increase = $145,000 + $80,000 = $225,000
Year 5: Cash flow = Operating cost savings + Revenue increase + Salvage value = $145,000 + $80,000 + $30,000 = $255,000
b. The Payback Period is the time required to recover the initial investment. To calculate it, we sum the cash flows until they equal or exceed the initial investment. Here's the calculation:
Payback Period = Number of years to recover initial investment
= 2 years (Year 1 cash flow + Year 2 cash flow)
+ (Remaining investment / Year 3 cash flow)
= 2 years + ($400,000 - $225,000) / $225,000
= 2 years + 0.7778 years
= 2.7778 years
c. To calculate the Net Present Value (NPV) and Profitability Index (PI), we need to discount the cash flows using the given discount rate of 15%. Here's the calculation:
Discount rate: 15%
Present value factor for each year:
Year 0: 1 / (1 + Discount rate)^0 = 1
Year 1: 1 / (1 + Discount rate)^1 = 0.8696
Year 2: 1 / (1 + Discount rate)^2 = 0.7561
Year 3: 1 / (1 + Discount rate)^3 = 0.6575
Year 4: 1 / (1 + Discount rate)^4 = 0.5718
Year 5: 1 / (1 + Discount rate)^5 = 0.4972
NPV calculation:
NPV = (Year 0 cash flow) + (Year 1 cash flow * Present value factor) + (Year 2 cash flow * Present value factor) + ...
= -$400,000 + ($225,000 * 0.8696) + ($225,000 * 0.7561) + ($225,000 * 0.6575) + ($225,000 * 0.5718) + ($255,000 * 0.4972)
Profitability Index calculation:
PI = NPV / Initial investment
= NPV / $400,000
d. To calculate the Internal Rate of Return (IRR), we find the discount rate that makes the NPV equal to zero. Here's the calculation:
IRR = Discount rate that makes NPV equal to zero
By calculating the NPV at various discount rates, we can determine the rate at which NPV is closest to zero.
e. Based on the information provided, we can determine if the fleet should be replaced by considering the Payback Period, NPV, Profitability Index, and IRR.
If the Payback Period is within the company's acceptable timeframe and the NPV is positive, or the Profitability Index is greater than 1, and the IRR exceeds the company's required rate of return, then replacing the fleet would be financially favorable. If any of these criteria are not met, it would indicate that the replacement may not be the best option.
Please note that the calculation of IRR requires further information, and the final decision should consider additional factors such as qualitative aspects, operational requirements, and strategic considerations.
Without the specific values for cash flows in each year, it is not possible to provide a definitive answer to whether the fleet should be replaced based on the given information.
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HELLP ASAP PLEASE!!!
Answer: 18) (9x)° + 45° = 180°-45°= 135° then we isolate the variable and the answer is 9x/9 which is equal to x = 15°.
Step-by-step explanation: 18) supplementary angles add up to 180 degrees. So a supplementary angle lies on a single, straight line
When solving the equation x/5 - 12 = 10, what is your last step?
A. Multiply by 5 on each side.
B. Add 12 to each side.
C. Divide by 5 on each side.
D. Subtract 12 from each side.
+10 points!
Answer:
c
Step-by-step explanation:
Lines v and w are parallel. If <1 measures 62°, what is the measure of <8?
The measure of angle 8 is 118°, and the measure of the angle opposite to it, angle 6, is 62°.
If lines v and w are parallel and angle 1 (denoted as <1) measures 62°, then angle 8 (denoted as <8) is supplementary to <1 (since they are corresponding angles on the same side of the transversal line) and thus measures 180 - 62 = 118°.
When two straight lines are cut by a transversal line, corresponding angles on the same side of the transversal are equal. Therefore, <8 and <1 are equal in measure. By transitivity, <8 is also equal in measure to the angle that is opposite it and adjacent to <1, which we could denote as <6.
We can apply the same reasoning to find the measure of angle 6. Since line v is parallel to line w, angle 6 and angle 1 are alternate interior angles, and thus are equal in measure. Therefore, <6 also measures 62°, and this is the measure of the angle opposite to angle 8.
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Can you help me solve this?
Y-intercept= 4, goes through the point (2, 3)
Please solve using y=Mx+b
Answer:
y=-1/2x+4 Is your answer
Step-by-step explanation:
y=mx+b
3=2x+4
-1=2x
x=-1/2
You already know y is 4 so y=-1/2x+4
Find the volume of a right circular cone that has a height of 18.5 in and a base with a diameter of 17.5 in. Round your answer to the nearest tenth of a cubic inch.
Answer:
Step-by-step explanation:
volume of cone formula: V = 1/3 πr²h
r = 1/2 d
r = 1/2 (17.5)
r = 8.75 in
V = 1/3 (π8.75²)(18.5)
V = 1483.26 in²
What will be the 50th term in the sequence defined by an = -11 +5(n − 1)?
Answer:
234
Step-by-step explanation:
Simplify the expression. an=5n-16. Substitute 50 for n. 5(50)-16= 250-16=234
For problems like this, simplifying the equation helps.
EASY POINTS!! BRAINLIEST TO THE BEST DISC!!
Answer: I BELIVE it’s 60
Step-by-step explanation:
Cynthia bought a shirt for $35 that was originally $55. What was the percent change in the price of the shirt? Round to the nearest hundredths place.
NO LINKS OR I WILL REPORT YOU
Answer:36.36%
Step-by-step explanation:
%change=100 X (final-inital value) divided by initial
Need asap please help
Answer:
(3)
Step-by-step explanation:
Write down the expression that results when the change of base formula is applied to log4(x+2).
The expression that results when the change of base formula is applied to log4(x+2) is log(x+2) / log(4).
1- Apply the change of base formula to log(x + 2):
log(x + 2) = log(x + 2) / log(10)
2- Apply the change of base formula to log(4):
log(4) = log(4) / log(10)
3- Rewrite the original expression, substituting the step 1 and step 2 results:
log(x + 2) / log(4) = (log(x + 2) / log(10)) / (log(4) / log(10))
4- Simplify by multiplying the numerator and denominator by the reciprocal of log(10):
log(x + 2) / log(4) = (log(x + 2) / log(10)) * (log(10) / log(4))
5- Cancel out log(10) in the numerator and denominator so we get:
= log(x + 2) / log(4)
Therefore, the expression resulting from applying the change of base formula to log4(x + 2) is log(x + 2) / log(4).
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(Number Theory) Please provide a detailed response and I
will be sure to upvote.
In plain language, answer the following questions:
(i) What is a complete residue system?
(ii) What is a primitive root
(i) A complete residue system is described as to a set of integers that shows all possible remainders when dividing any integer by a given modulus.
(ii) A primitive root is described as an integer that generates all possible residues modulo a given modulus.
What are the applications of primitive root?When primitive roots exist, it is often very convenient to use them in proofs and explicit constructions.
Say for example, if p is an odd prime and g is a primitive root mod p, the quadratic residues mod p are precisely the even powers of the primitive root.
Primitive roots also finds numerous applications in number theory, cryptography, and discrete mathematics.
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Consider the following theorem. Main Theorem. Assume that n is any positive integer. Then 7 Ik = n(n+1) 2 k%3D1 (a) Illustrate the main theorem for the values n =1,2,3, 4, 5, 6 and 7. value the sum k n(n+1) 2 Does the IM k=1 of n theorem hold? 1 2 3 4 5 6 7 (b) State the Induction Step Theorem for n = 64, and prove it. Use a direct proof.
(c) State the Induction Step Theorem for n = 583, and prove it. Using direct proof
(d) Assume that N is any positive integer. State the Induction Step Theorem for the value n = N, and prove it.
(e) Explain in English in a few sentences in your own words why the proof of the induction step in d) combined with the verification of several base cases in a) complete the proof of the Main Theorem.
This is all one question based on the same main theorem
(a) The main theorem states that the sum of terms in the given sequence satisfies the equation n(n+1)/2 for various values of n.
(b) The induction step theorem for n = 64 states that if the main theorem holds for n = k, it also holds for n = k + 1.
(c) The induction step theorem for n = 583 states that if the main theorem holds for n = k, it also holds for n = k + 1.
(d) The induction step theorem for n = N states that if the main theorem holds for n = k, it also holds for n = k + 1.
(e) The combination of the induction step in (d) and verification of base cases in (a) completes the proof of the main theorem for all positive integers.
(a) The main theorem states that for any positive integer n, the sum of the terms k=1 to n of the sequence n(n+1)/2 is equal to n(n+1)/2.
Illustrating the main theorem for different values of n:
For n = 1: The sum is 1(1+1)/2 = 1, which holds true.
For n = 2: The sum is 2(2+1)/2 = 3, which holds true.
For n = 3: The sum is 3(3+1)/2 = 6, which holds true.
For n = 4: The sum is 4(4+1)/2 = 10, which holds true.
For n = 5: The sum is 5(5+1)/2 = 15, which holds true.
For n = 6: The sum is 6(6+1)/2 = 21, which holds true.
For n = 7: The sum is 7(7+1)/2 = 28, which holds true.
(b) The Induction Step Theorem for n = 64 states that if the main theorem holds for n = k, then it also holds for n = k + 1.
To prove it, assume that the main theorem holds for n = k, i.e., the sum of k terms is k(k+1)/2.
Then, we need to show that the sum of (k+1) terms is (k+1)((k+1)+1)/2 = (k+1)(k+2)/2.
By adding the (k+1)th term to the sum of k terms, we get (k(k+1)/2) + (k+1) = (k+1)(k+2)/2, which is the desired result.
(c) The Induction Step Theorem for n = 583 states that if the main theorem holds for n = k, then it also holds for n = k + 1.
To prove it, assume that the main theorem holds for n = k, i.e., the sum of k terms is k(k+1)/2.
Then, we need to show that the sum of (k+1) terms is (k+1)((k+1)+1)/2 = (k+1)(k+2)/2.
By adding the (k+1)th term to the sum of k terms, we get (k(k+1)/2) + (k+1) = (k+1)(k+2)/2, which is the desired result.
(d) The Induction Step Theorem for n = N states that if the main theorem holds for n = k, then it also holds for n = k + 1.
To prove it, assume that the main theorem holds for n = k, i.e., the sum of k terms is k(k+1)/2.
Then, we need to show that the sum of (k+1) terms is (k+1)((k+1)+1)/2 = (k+1)(k+2)/2.
By adding the (k+1)th term to the sum of k terms, we get (k(k+1)/2) + (k+1) = (k+1)(k+2)/2, which is the desired result.
(e) The proof of the induction step in (d) combined with the verification of several base cases in (a) completes the proof of the Main Theorem because it establishes that the theorem holds for all positive integers. The induction step shows that if the theorem holds for any positive integer, it also holds for the next integer. By verifying the base cases, we ensure that the theorem holds for the initial integers. Therefore, by the principle of mathematical induction, the theorem holds for all positive integers.
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Help! Look at my last most recent question for 100 points. This one only offers 10.
Answer: 2.43m^3
Step-by-step explanation:
Answer: 2.43cm^3
Step-by-step explanation:
PLEASE mark me BRAINIEST! One more until next ranking!
Find the total cost if the price of a netbook is 375.00.
Answer:
387.50.
Step-by-step explanation:
In a certain population, 18% of the people have Rh-negative blood. A blood
bank serving this population receives 95 blood donors on a particular day. Use the normal
approximation for binomial random variable to answer the following: (a) What is the
probability that 15 to 20 (inclusive) of the donors are Rh-negative? (b) What
is the probability that more than 80 of the donors are Rh-positive?
a) The probability that 15 to 20 (inclusive) of the donors are Rh-negative is 0.5406.
b) The probability that more than 80 of the donors are Rh-positive is 0.0199.
(a) Given that p = 0.18 and q = 0.82
The mean, μ = np = 95 × 0.18 = 17.1
The variance, σ² = npq = 95 × 0.18 × 0.82 = 13.77
Then, the standard deviation σ = √(npq) = √13.77 ≈ 3.71
Using the Normal approximation for binomial distribution, we need to find the probabilities of P(X ≤ 20) and P(X ≤ 14).
P(X ≤ 20) = P(Z ≤ (20 - μ) / σ) = P(Z ≤ (20 - 17.1) / 3.71) = P(Z ≤ 0.78) = 0.7823P(X ≤ 14) = P(Z ≤ (14 - μ) / σ) = P(Z ≤ (14 - 17.1) / 3.71) = P(Z ≤ -0.84) = 0.2005
The required probability is given by;
P(15 ≤ X ≤ 20) = P(X ≤ 20) - P(X ≤ 14) = 0.7823 - 0.2005 = 0.5406
Therefore, the probability that 15 to 20 (inclusive) of the donors are Rh-negative is 0.5406.
b) We are required to find the probability that X > 80.Given that p = 0.82 and q = 0.18
The mean, μ = np = 95 × 0.82 = 77.9
The variance, σ² = npq = 95 × 0.82 × 0.18 = 13.77
Then, the standard deviation σ = √(npq) = √13.77 ≈ 3.71P(X > 80) = P(Z > (80 - μ) / σ) = P(Z > (80 - 77.9) / 3.71) = P(Z > 0.57) = 0.2843
The probability that more than 80 of the donors are Rh-positive is 0.0199.
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Answer:
b
Step-by-step explanation:
u start at (0,9.5) and with every increasing x value the y value is decreasing by .5 units