Write a method stdev that computes the standard deviation of an array of real numbers. The formula for computing a standard deviation s of N values is the following, where xi represents each i th...

Write a method stdev that computes the standard deviation of an array

of real numbers. The formula for computing a standard deviation s of N

values is the following, where xi

represents each i

th element and μ

represents the arithmetic mean (average) of all the elements:

σ=1N∑i=1N(xi−μ)2