Find the variance of the numbers listed

Question

What is the variance of

40 39 38 32 22 19 18 15 14.9 13.5

Answer 1

Compute the mean (xbar) as the sum of all the values (x(i), where i = 1 to 10), then divide that sum by the sample size (10).

Compute the variance as (sum of (x(i) - xbar)^2)/(sample size - 1).