If x [0], x[1],...., x[N] is a list of N numbers and the mean (average) of these numbers is M, then we define their standard deviation to be the square root of the number as follows:
( (x[0]-M) ^2 + (x[1]-M) ^2 + .......+ (x[N]-M) ^2) / (N-1)
Input an array of numbers, terminated by 0 (which is not considered one of the number), and find its mean and standard deviation.