help me

LOL I have Pikachu in game though.

The formula for standard deviation is :

Let there are n numbers in a set x and the mean of the set is $\mu$Moooooo XDD

 $\sigma=\sqrt{\dfrac{(x_1-\mu)^2+(x_2-\mu)^2+......+(x_n-\mu)^2}{n}}$