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

Answer:

the answer is 2.7

Step-by-step explanation:

Answer 2

Answer:

The variance of the given sample is 7.3

Hence the option A. 7.3 is correct

Step-by-step 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:

$Variance = \frac{66}{10-1} =7.3$