What is the variance of 17,19,21,18,20,18,19,20,20,21 ?

The variance of 17,19,21,18,20,18,19,20,20,21 is 1.78888…

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variance of 17,19,21,18,20,18,19,20,20,21

variance

17, 19, 21, 18, 20, 18, 19, 20, 20, 21

1.78888 \dots

Solution steps

Compute the average,

\overset{x}{ˉ} : 19.3

Compute

i = 1 \sum n (x_{i} - \overset{x}{ˉ})^{2} : 16.1

Compute the number of terms in the data set:

n = 10

Compute

Va r (X) = i = 1 \sum n \frac{( x _{i} - x ˉ ) ^{2}}{n - 1} : 1.78888 \dots

1.78888 \dots

14 p 9

8 c 5

4 c 2

45 c 4

C (52, 1)

What is the variance of 17,19,21,18,20,18,19,20,20,21 ?
The variance of 17,19,21,18,20,18,19,20,20,21 is 1.78888…