Question

Random pages were chosen from a variety of children’s books and the number of words on each page was recorded. Find the variance of the sample pages.

10 15 8 16 14 12 9 12 14 10


A. 7.3


B. 2.4


C. 2.7


D. 1.5


PLEASE just give a straight up answer. Thank you!

Answer 1

the answer is 2.7

Explanation:

Answer 2

The variance of the given sample is 7.3

Hence the option A. 7.3 is correct

Explanation:

The formula of Variance is:

`Var=\frac{\sum (x- \bar{x})^2}{n-1}`

x
`(x-\bar{x})^2`

10 4

15 9

8 16

16 16

14 4

12 0

9 9

12 0

14 4

10 4

`\sum ( x - \bar{x}) ^2 = 66`

Therefore, the variance is:

`Variance = (66)/(10-1) =7.3`