# What is the variance of {40; 56; 59; 60; 60; 62; 65; 69; 75; 84}?

At first find $\sum$x and $\sum$x^2
$\sum$x = 630
$\sum$ x^2 = 40928
Then, use the formula, Variance = $\sum$x^2/n - ($\sum$x/n)^2