java - What is the correct formula and method of calculating standard deviation

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Answer 1

Allthough it's hardcoded af, in your case this would be the solution:

double standardDeviation = Math.sqrt(Math.pow((n1-mean),2) + Math.pow((n2-mean),2) + Math.pow((n3-mean),2) + Math.pow((n4-mean),2) + Math.pow((n5-mean),2)) / 5);

Add this after caclculation of the mean and that's it. Don't forget to import Math library (import java.lang.Math;). But it's a very ugly way to code. You should change this and work with loops instead.