How to use standard deviation calculator?

According to the formula for the calculations of the standard deviation, it requires set of numbers separated by comma.

Example-1 :

Maths score obtained by the student are: 91, 91,91,41,51

Formula :

$$SD=σ=\sqrt\frac{\sum(x-µ)^2}{n}$$

Example-2 :

Physics score obtained by the student are: 90, 90, 90, 50, 50

Formula :

$$SD=σ=\sqrt\frac{\sum(x-µ)^2}{n}$$