C Assignment I need help Explain how do I use a formula for

C++ Assignment: I need help!

Explain how do I use a formula for standard deviation, thank you!

Solution

For standard deviation, first run a for loop calculating two things in two different variables, sum of all elements in array and sum of squares of elements in array .

Once we got these values in variables say ,    sumElements and sumSquareElements

Next, do this :             multiply sumSquareElements with n, and subtract square of sumElements from it, and get the value in say var V. Now divide V by (n*(n-1)) and use the function sqrt in C++ <cmath> library to return the square root.

One thing to note is that, when dividing V by (n*(n-1)), V would be an integer, and resulting value would be rounded off, so it is better to   do it as :           (V*1.0)/(n*(n-1))