What is the variance of 7,8,9,7,3,5,5 ?

The variance of 7,8,9,7,3,5,5 is 4.23809…

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variance of 7,8,9,7,3,5,5

variance

7, 8, 9, 7, 3, 5, 5

4.23809 \dots

Solution steps

Compute the average,

\overset{x}{ˉ} : 6.28571 \dots

Compute

i = 1 \sum n (x_{i} - \overset{x}{ˉ})^{2} : 25.42857 \dots

Compute the number of terms in the data set:

n = 7

Compute

Va r (X) = i = 1 \sum n \frac{( x _{i} - x ˉ ) ^{2}}{n - 1} : 4.23809 \dots

4.23809 \dots

0.956, 0.913, 0.925, 0.843, 0.938, 0.884, 0.913, 0.913, 0.957, 0.946, 0.918

1, 2, 3, 4

1, 2, 3, 4, 6

5 C 4

18 C 3

What is the variance of 7,8,9,7,3,5,5 ?
The variance of 7,8,9,7,3,5,5 is 4.23809…