Question

What is the variance and standard deviation of 14, 16, 19, 20, 28, 7, 24, 15, 16, 30, 33, and 24?

Answer 1

The variance \(\sigma^2\) is given by, for the average \(\mu\) of the set \(S\):
\[
\sum_S(\mu-S)^2=\sigma^2
\]While the population standard deviation is given by:
\[
\sigma=\sqrt{\sigma^2}
\](Hence the use of such notation)
Try using that.