MATHEMATICS HIGH SCHOOL

The test scores of a geometry class are given below.90, 75, 72, 88, 85
The teacher wants to find the variance for the class population. What is the value of the numerator of the calculation of the variance?

Answers

Answer 1
Answer: Variance is the difference of the number from the mean of the group of numbers then square it and find the average. In this case, we need to find the mean first. 90 + 75 + 72 + 88 + 85 = 410/5 = 82 . Now we must get the difference of each from the mean. 
90 - 82 = 8
75 - 82 = -7
72 - 82 = -10
88 - 82 = 6
85 - 82 = 3
Next is to find the average of the square of the numbers.
(8^2) + (-7^2) + (-10^2) + (6^2) + (3^2) is
64 + 49 + 100 + 36 + 6 = 255. Next step is to simply divide it by 5. The numerator in calculating the variance is the sum of the square of the numbers which is 255.
Answer 2
Answer:

Answer:

258

Step-by-step explanation:

Related Questions

HELP ASAP!!! BRAINLIEST!
Write the ratio in its simplest form. 1.4/7
Lucas is making accessories for the soccer team, he uses 685.85 of fabric on headbands for 41 players and 2 coaches. He also uses 353.83 inches of fabric on wristbands for the just the players. How much fabric was used on a headband and wristband for each player?
What is the slope of a trend line that passes through the points (1, 3) and (10, 25)?
The length of the walk-in closet is 2 more than 5 times its width. If the perimeter of thecloset is 64 feet, what is its width?

How do you solve 27.5% of 88

Answers

answer:

im getting different answers so  wait ill do it myself

Step-by-step explanation:

PPPPPPPPPPPLLLLLLLLLLZZZZZZZ HELPPPPP I WILL GIVE 50 POINTS

Answers

Hello!

Reading these types of graphs can be difficult, but it displays the following numbers:

27, 30, 31, 43, 45, 49, 51, 58, 62, 64

To find mean, or average, you need to add up all of the numbers and divide by how many there are (10)

This will give you 46.

I hope this helps you and good luck!

Your answer should be 46.  

Hope it helps!

How to factor: a^2+11a+18

Answers

a^2+11a+18\n\n-----------------------------\n\n11=9+2\n18=9\cdot2\n\n-----------------------------\n\na^2+11a+18=(a+9)(a+2)
a^2+11a+18=a^2+2a+9a+18=a(a+2)+9(a+2)=\n\n=(a+2)(a+9)

If the triangle on the grid below is translated by using the rule (x, y) right-arrow (x + 5, y minus 2), what will be the coordinates of B prime? On a coordinate plane, triangle A B C has points (negative 1, 0), (negative 5, 0), (negative 1, 2). (–2, 0) (0, –2) (5, –7) (5, –2)

Answers

Answer:

(0, –2)

Step-by-step explanation:

I am assuming that point 'B' is (-5 , 0).

The translation rule is: (x,y)\rightarrow(x+5,y-2).

Apply the rule to point 'B':

((-5,0)\rightarrow(-5+5,0-2))/((x,y)\rightarrow(x+5,y-2))\rightarrow\boxed{(0,-2)}

B' should be (0, -2).

Answer:

Guy above me might be right but Im not sure. Im on the cumulative exam on edge.

Step-by-step explanation:

Daniel collected 120 sports cards. Fifty-five of the cards are baseball cards . About what percent of the cards are baseball cards? Round to the nearest percent

Answers

To find the percentage (or probability) of something, we have to take the selected amount over the total number.  

Therefore, our fraction or percentage is 55/120, which when divided equals 0.4583.

Rounded to the nearest percentage, this would be approximately 46%.
To find the percentage, divide 55/120, then move the decimal 2 places to the right
.458333
45.83%

Find the solution of the equation 1/2x^2 -x +5=0

Answers

If you would like to solve the equation 1/2 * x^2 - x + 5 = 0, you can do this using the following steps:

1/2 * x^2 - x + 5 = 0      /*2
x^2 - 2x + 10 = 0
(x - 1)^2 + 9 = 0
1. x = 1 - 3 * i
2. x = 1 + 3 * i

The correct result would be x = 1 - 3 * i and x = 1 + 3 * i.
Other Questions
HELP!!!! Divide. Write your answer in lowest terms as a proper or improper fraction (not a mixed number). 11/21 divided by 22/7
Find both unit rates.$8.40 for 8 ice-cream conesA.$0.95 per cone and 1.05 cones per dollar B.$1.05 per cone and 0.95 cones per dollarC.$2.10 per cone and 1.9 cones per dollarD.$1.90 per cone and 2.1 cones per dollar
10 is 5% of what number
Can someone explain the answer llease? I dont understand.