Answer:
Is this middle school math I believe tha answer is 0.9
Step-by-step explanation:
I did it before pretyy sure thats what it is
The number of hours of TV watched each week by 8 seventh grade students is shown below.
11, 7, 9, 3, 3, 8, 10, 5
a. What is the mean number of hours of TV watching?
b. Mean absolute deviation =
c. Explain the meaning of the mean absolute deviation as it relates to the number of hours of TV watched.
Answer:
a) 7 hours ; b) 2.5 hours ; c) look at explanation
Step-by-step explanation:
a)
The mean of a data set is what we usually refer to as the average. To find the mean, you add up all of the values and divide by the number of values.
So, to find the mean, you need to add all of the values (the "value" is the the number hours each student watched)
11 + 7 + 9 + 3 + 3 + 8 + 10 + 5
= 56
You have 8 seventh-grade students, so your number of values is 8.
Dividing the sum of the values by the number of values would then be:
56 / 8
= 7
So, your mean is 7.
---------------------------------------
b)
(A deviation is how much a value differs from a certain value. If a person was supposed to be 5 feet tall, and they were 6 feet tall, they would deviate 1 foot from the value of 5. If the person was 4 feet tall, they would also have a deviation of 1 foot.)
The mean absolute deviation is complicated. You probably want to set up two columns (or at least this is how I was taught to do it), the first column being the value (represented by x in the mean absolute deviation formula), the second column being the difference between the mean of the data set and the value (the mean is represented as x with a line over it).
∑ is the sum of the values of the second column.
To find the mean (remember, mean = average) of the deviations, you are going to add all of the deviations together, and divide by your number of values.
I'll write out the second column (the difference from mean) below:
| x - [tex]\frac{}{x}[/tex] |
4
0
2
4
4
1
3
2
if you add all of these values up, you will get 20; ∑ = 20
[ | | means absolute value--essentially the distance of the value from 0, so a negative number is written as a positive numbers; |-3| = 3 ; |3| = 3 ]
Now you will find the mean of your deviations. The sum of all deviations (∑) = 20. The number of deviations/the number of values is 8.
So, the equation of 20 / 8 will give us the absolute mean deviation.
20/8 = Mean Absolute Deviation
Mean Absolute Deviation = 2.5
Your Mean Absolute Deviation is 2.5 [hours] .
------------------------------------------------
c)
Now you are being asked to interpret what this 2.5 indicates. It means that each student has, on average, a difference of 2.5 hours of TV watched from the mean. The Mean Absolute Deviation gives us a sense of how spread out the values of a data set are. We know that a mean absolute deviation of 0 would indicate that all values of the set are exactly identical. A mean deviation of 100 would indicate that all of the values are drastically different. So, a mean deviation of 2.5 indicates that all of the values (each student's watch hours) are fairly similar.
What is the least common denominator of 1/4 and 2/5?
Answer:
20
Step-by-step explanation:
because 4 can go into 20 5 times without a remainder
Answer:
1/4 = 1/4 × 5/5 = 5/20
2/5 = 2/5 × 4/4 = 8/20
Therefore, the LCD is 20
Step-by-step explanation:
I’m studying for a test, could you help me with A, B, and C? (image below)
Answer:
a = 51
b = 51 (??not so sure)
c = 20 cents
Step-by-step explanation:
a) 25 x 408 = 10200
10200 ÷ 200 = 51 square ft is one one roll.
b) the surface area of an average gift is 51 sq ft (?)
c) 40 ÷ 200 = 0.2
each roll costs $40 dollars. each roll can wrap 200 gifts so 40 ÷ 200 = $0.20/ 20 cents
PLEASE HELP ME MY BRIAN IS LIKE PUTTY 50 points for correct answerr
Triangle PQR is transformed to triangle P'Q'R'. Triangle PQR has vertices P(3, −6), Q(0, 9), and R(−3, 0). Triangle P'Q'R' has vertices P'(1, −2), Q'(0, 3), and R'(−1, 0).
Plot triangles PQR and P'Q'R' on your own coordinate grid.
Part A: What is the scale factor of the dilation that transforms triangle PQR to triangle P'Q'R'? Explain your answer.
Part B: Write the coordinates of triangle P"Q"R" obtained after P'Q'R' is reflected about the y-axis.
Part C: Are the two triangles PQR and P''Q''R'' congruent? Explain your answer.
Answer:
Part A :
The scale factor of the dilation that transforms triangle PQR to triangle P'Q'R' is divided by 3.
Part B :
P"(-1,2), Q"(0,3), R"(1,0)
Part C :
Triangle PQR and P"Q"R" are not congruent because congruent means equal and similar but triangle PQR and P"Q"R" are proportional because they are rational to each other but do not have the same measures of sides but the angles are congruent.
This is the graphing of the triangle.
Trey made a scale drawing of a microchip using s scale of 2 inches to 1 centimeter. His drawing was an enlargement that depicted the chip as 6inches long and 4 inches wide. However, the drawing isnt big enough to clearly show all of the chips components. So he wants to make the drawing bigger. Complete the steos below to figure the dimensions if trey changes the scale to 3 inches to 1 centimeter.
A) What is the actual length of the microship?
B) What is the actual width of the microchip?
C) Trey wants to change the scale of the drawing to 3in to 1cm. Use the actual length from part A to find the length of the microchip in treys new scale drawing.
D) Use the actual width from part B to find the width of the microchip in treys new scale drawing.
E) what is the ratio of a drawing measurement from the original scale to the corresponding drawing measurement in the new scale?
Answer:
A) The actual length of the microchip is 3 centimeters.
B) The actual width of the microchip is 2 centimeters
C) The ratio of the original scale drawing measurements to the new scale drawing measurements is 2 inches to 3 inches.
Step-by-step explanation:
A) actual length = scale length × reciprocal of scale factor
The scale is 2 inches to 1 centimeter, so the scale factor is. 2in/1cm The reciprocal of the scale factor is. 1cm/2in The length of the chip in the scale drawing is 6 inches.
= 6 in. x (1cm/2in)
= 3 cm
B) actual width = scale width × reciprocal of scale factor
= 4 in. x (1cm/2in)
= 2 cm
C) The original scale drawing, the microchip was 6 inches long. It is now 9 inches long.
Ratio: 6in/9 in 3in/2in
The microchip was 4 inches wide. In the new scale drawing, the microchip is 6 inches wide.
Ratio: 4in/6in 2in/3in
3% of a university's freshman class are majoring in Computer Science. If 231 students in the freshman class are Computer Science majors, how many students are in the freshman class?
Tell whether the angles are complementary or supplementary. Then find the value of x.
help pls i don't get it...
Answer:
The angles are complementary, hence the answer is the second one.
Step-by-step explanation:
Since 90° - 65° = 25°, we know that 5x =25°, hence x is equal to 25° ÷ 5, which is 5°, hence, x = 5° and the answer is the second one
Hope this helps :))
P.s. can you mark me as the brainliest? <3
Answer:
(b) Complementary; x = 5
Step-by-step explanation:
Angles are complementary when the total of their measures is 90°. Angles are supplementary when the total of their measures is 180°. A right angle has a measure of 90°, so any pair of angles that has the same total measure as a right angle are complementary angles.
__
interpreting the figureThe little square in the corner of the figure indicates that angle is a right angle, and has a measure of 90°. The ray headed off to the northeast divides that 90° angle into two parts, labeled 65° and 5x°. In math, the whole is the sum of the parts, so the 90° angle is the sum of the 65° and 5x° angles.
Those two angles total 90°, so they are complementary.
making use of the relationNow that you understand the sum of the two marked angles is 90°, you can use that fact to write an equation:
65° +5x° = 90° . . . . equation relating the complementary angle measures
solutionThis is a 2-step linear equation, so is solved the way that kind of equation is solved.
5x° = 25° . . . . . step 1: add the opposite of 65° to get the x-term alone
x = 5 . . . . . . . . .step 2: divide by the coefficient of x to get x alone
The angles are complementary, and the value of x is 5.
_____
Additional comment
In order to keep the equation true, whatever operation we perform on one side of the equation must also be performed on the other side. When we say "add -65°", we mean that value is added to both sides of the equation. Above, we have skipped the steps of showing that addition and the subsequent simplification. (Similarly, we skipped the steps showing the division and the simplification process.)
65° +5x° = 90° . . the original equation. We want to eliminate the 65° term.
65° +(-65°) +5x° = 90° +(-65°) . . . . . add -65° (to both sides)
(65° -65°) +5x° = (90° -65°) . . . . . simplify the expressions a bit
0° +5x° = 25° . . . . . . . . . . . do the subtraction
5x° = 25° . . . . . . . . . . . 0 is the identity element for addition. Adding it changes nothing.
What is the answer? please
Answer:
The answer is 8
Please mark me as brainliest
Answer:
8
Step-by-step explanation:
Pythagoras theorem
A^2 +b^2 = C^2
please mark as brainliest
An Iowa farmer grows wheat and corn on his farm. This year, he planted 215 acres of corn. He planted 60 fewer acres of wheat than of corn this year. How much wheat did the farmer plant this year?
Answer:
155 acres
Step-by-step explanation:
corn = 215
wheat = 215 - 60 = 155
Please, my brain went blank and I didn't know how to answer this
The diagram shows a sailboat. What is the approximate length of the sail shown?
RIGHT Triangle Dimensions:
Leg 1: 14 feet
Leg 2: Missing "X"
Hypotenuse: 18 feet
Answer: 8√2
Step-by-step explanation:
Plug in with the Pythagorean theorem: a^2 + b^2 = c^2
So we have 18^2=14^2 + x^2
Solve for X
X is 8√2
The vertices of figure A are located at (2, 2), (4, 2), (4, 4). The transformation f(x, y) = (½x, ½y+2) transforms figure A into figure B. Which of the following sets of transformations would transform figure B back into figure A?
A dilation by a factor of 2 centered at the origin, followed by a translation down 4 units.
A translation down 4 units, followed by a dilation by a factor of 2 centered at the origin.
A dilation by a factor of ½ centered at the origin, followed by a translation up 2 units.
A dilation by a factor of 2 centered at the origin, followed by a translation down 2 units.
Answer:
b
Step-by-step explanation:
because its a reasonal answer if you do the math
(THIS MY FINAL DAY AT SCHOOL SO I NEED HELP)
Answer:
D. (1/3)
Step-by-step explanation:
If we look at the graph, there are a total of 12 squares, which means we have a denominator of 12.
Next if we look at the answer, it is asking if for the chance of us getting a number under 5 and is a heads, which means there are 4 squares that would apply to this (They have to be both under 5 and be a heads)
This results in us having a numerator of 4.
So If we put it together we get 4/12, which when simplified equals 1/3!
Hope this helps! If you have any further questions, feel free to comment and if this somehow is wrong, let me know so i can fix my answer for future users!
find the measure of MNI. please help! i’ll give you brainlist!
Answer:
[tex]m\angle MNI = 135^{\circ}[/tex]
Step by step explanation:
[tex]\text{The exterior angle of a triangle = sum of two opposite interior angles.}[/tex]
[tex]~~~~~~\angle MNI = \angle LMN + \angle MLN\\\\\implies 19x+2=(15x-12)+6x\\\\\implies 19x +2 = 21x-12\\\\\implies 21x -19x = 12+2\\\\\implies 2x = 14\\\\\implies x=\dfrac {14}2\\\\\implies x = 7\\\\\text{So,}~ m\angle MNI = 19(7)+2=135^{\circ}[/tex]
Answer the following sections about adjacent angles
Answer:
adjacent angles are angles that share a side and a common vertex, basically, they are just angles next to each other that are formed by the same point.
Step-by-step explanation:
all adjacent angles are
2,1
2,3
1,4
3,4
6,7
6,5
8,5
8,7
10,11
10,9
12,9
12,11
please help me thank you
Answer:
Unit fraction cubes is 8
Blue cube = 1/2
Step-by-step explanation:
1/2 in × 1/2 in × 1/2 in = 1/8 in³
unit fraction cubes × 1/8 in³ = 1 in³
then the unit fraction cubes is equal to 8
8 × 1/8 in³ = 1 in³
Answer:1/8 cubic inches is the volume of the cube
Step-by-step explanation:
To the nearest thousandth, what is the decimal form of 9/14
Answer:
.643
Step-by-step explanation:
just put it in the calc and round
Answer:
0.6429
Step-by-step explanation:
[tex]9\sqrt{14} = 0.64285\\round up to nearest thousandth = 0.6429[/tex]
(Will give 25 points!) Solve the system of linear equations by substitution. 3x - 2y = 12 and 4x + 2y = 16
Let
Eq1 : x - 2y = 12
Eq2 : 4x + 2y = 16
For substitution, we need to rearrange on of the equations so that we can substitute it in the other. Let's pick eq2 and rewrite it as 2y = 16 - 4x. We see that eq1 also has 2y in it, so we can plug this new version of eq2 in there.
3x - (16-4x) = 12
Now solve for x.
7x=28, so x=4
Plug that into either equation to solve for y. You get y=0.
So your answer is x=4, y=0
Answer:
i think its X squared=y squared +4
Step-by-step explanation:
thats what i got
What is the least positive integer by which 24 should be divided so that the resulting integer is a perfect square?
24 = 2 × 2 × 2 × 3
In a perfect square, all the prime factors occur in pairs.
In 2 × 2 × 2 × 3, 2 occurs in a pair, and only one each of 2 and 3 remains unpaired.
So, the least positive integer by which 24 should be divided to get a perfect square = 2 × 3 = 6.
What is the least positive integer by which 224 should be divided so that the resulting integer is a perfect square?
The least positive integer =
The resultant integer =
pls explain to me I need to understand too
answer quickly
Answer: divide by 6?
Step-by-step explanation:
What is the least positive integer by which 24 should be divided so that the resulting integer is a perfect square?
If we actually guess and check by dividing by 1, then 2, then 3, then etc. we will get the answer. I tried and divided by 6, which is 4, which is a perfect square. Do not trust me completely on this, for I am not quite sure.
HELP ASAP!!!! which measurements could create more than one triangle?
Answer:
75 degrees, 45 degrees, and 60 degrees
Step-by-step explanation:
When we are given three angles any number of triangles can be formed.
Answer:
More than one triangle can be formed by three angles measuring 75°, 45° and 60
Step-by-step explanation: So, the answer would be (A)
simplify 2(-n-3)-7(5+2n)
Answer:
-16n - 41
Step-by-step explanation:
To simplify the equation, you need to get rid of the parentheses by multiplying the numbers outside the parentheses to the numbers inside. Then, you can combine the similar terms.
2(-n - 3) - 7(5 + 2n) <---- Original equation
-2n - 6 - 7(5 + 2n) <---- Expand first parentheses by mult.
-2n - 6 - 35 - 14n <---- Expand second parentheses by mult.
-16n - 6 - 35 <---- Combine terms with "n"
-16n - 41 <---- Combine whole numbers
Answer:-2n-29
Step-by-step explanation:2*-n=-2n
2*-3=-6
-7*5=35
-7*2n=-4n
2n-6-35-44n
2n-4n=-2n
6-35=-29
2n-29
two semicircles are used to make the shaded shape below one semiciricle has a diameter of 16 cm and the other has a diameter of 20 cm work out the area of the shaded shape
please help me!
What is the radius and diameter of the following circle? 13\,\text{cm}13cm Radius ==equals \text{cm}cmstart text, c, m, end text Diameter ==equals \text{cm}cm
Answer:
Radius = 6.5cm
Diameter = 13cm
Step-by-step explanation:
The diameter is the length of one side of a circle to the other. It's already given in the diagram as 13cm.
The radius is half of the diameter. 13 divided by 2 is 6.5cm.
3a: complete the table with values for x and y that makes this equation true 3x+y=15
3b: create a graph, plot these points, and find the slope of the line that goes through them.
Answer:
a. see the attachment for the table (also reproduced below)
b. slope = -3; see the attachment for a graph
Step-by-step explanation:
A table of values for the function can be filled a couple of ways. One way is to draw the graph of the equation, and read the point values from it. Another way is to solve for each of the variables, and use those equations to find the missing table values.
__
a.Solving the equation for y, we get ...
3x +y = 15
y = -3x +15 . . . . . . subtract 3x; this is "point-slope form"
For the purpose of evaluating for different values of x, we can rearrange this a bit to ...
y = 3(5 -x) . . . . factor out 3
The given table has x-values of 0, 2, 3, 6. The corresponding y-values are ...
y = 3(5 -{0, 2, 3, 6}) = 3{5, 3, 2, -1} = {15, 9, 6, -3} . . . . for x={0, 2, 3, 6}
Solving the equation for x, we get ...
y/3 = 5 -x . . . . . divide the above equation by 3
x = 5 -(y/3) . . . . . add x-(y/3)
For y-values {0, 3, 8}, the corresponding x-values are ...
x = 5 -{0, 3, 8}/3 = 5 -{0, 1, 8/3} = {5, 4, 7/3} . . . . for y={0, 3, 8}
Then our table of values is ...
[tex]\begin{array}{|c|c|c|c|c|c|c|c|}\cline{1-8}x&2&4&6&0&3&5&7/3\\y&9&3&-3&15&6&0&8\\\cline{1-8}\end{array}[/tex]
__
b.The points in the above table can be plotted, and the line drawn through them. Sometimes using the points that are farthest apart makes this easier: (0, 15) and (6, -3).
slope
When we solved for y, we had the equation in slope-intercept form. The slope is the x-coefficient in that equation:
y = -3x +15 ⇒ slope = -3
Graphing Coordinates
Help!
I already did the drawing part I just need the numbers!
(The door that needs to be coordinated is the one on the bottom)
Answer:
(-10,0)(-5,0)(-10,-10)(-10,-5)
Step-by-step explanation:
If we count each box as one unit then we just count and if you left or down it is negative
Which data set contains an outlier:
please help me with a step by step explanation on how to solve it.
Answer:
360
Step-by-step explanation:
blue square=lengthxwidthxheight
12x2x10=240
red square is same
8x3x5=120
120+240=360
I need an answer. What is 485-352?
Answer:
133
Step-by-step explanation:
ill give brainly and 20 points
Aakesh has two bags of marbles. The first bag contains 6 red marbles, 4 blue
marbles, and 5 green marbles. The second bag contains 3 red marbles, 1 blue
marble, and 5 green marbles. Aakesh will randomly select one marble from
each bag.
What is the probability that Aakesh will select a green marble from each bag?
A. 4/9
B.1/3
C. 5/9
D. 5/27
The answer for the 1st bag is option B = 1/3
The answer for the 2nd bag is option C = 5/9
Number of marbles in 1st bag - 15 (6 red, 4 blue & 5 green)
Number of marbles in 2nd bag - 9 (3 red, 1 blue & 5 green)
The formula of probability = Total number of events in the outcome /total number of outcomes.
Now the probability that Aakesh will select a green marble from the 1st bag is 5(green marbles)/15(total number of marbles in 1st bag)
That is 5/15=1/3
Now the probability that Aakesh will select a green marble from the 2nd bag is 5(green marbles)/9(total number of marbles in 1st bag)
That is 5/9
To know more about probability go to - https://brainly.in/question/17157610?msp_poc_exp=6
•ω• Hewo fren!
☆☆●◉✿ Answer:✿◉●☆☆
C.) 5/9
☆☆●◉✿Step-by-step explanation:✿◉●☆☆
First we must figure out how many marbles we have in total.
Meaning we will add all of the marbles together in bag one and then bag two.
Bag one: 6+4+5= 15
Bag two: 3+1+5= 9
Total= 24 marbles
Now we will try and figure out how many greens are in the total amount of marbles.
Amount of green marbles in bag one: 5
Amount of green marbles in bag two: 5
Total green marbles: 10
The third and final step!
10/24 is the amount of green marbles so the answer is C!
Hope I helped~! >w<→⇒brainliest please? ∑(OΔO )♥♥︎