How to calculate sample and population variances in Matlab?

Question

I have a vector a

a = [86 100 41 93 75 61 76 92 88 97]

And I want to calculate the std and mean by

Answer 1

An unbiased sample variance is given by:

>> 1/(length(a)-1) * sum((a-mean(a)).^2)

ans =

  335.2111