Mean and standard deviation. Write a program that reads a set of floating-point data values. Choose an appropriate mechanism for prompting for the end of the data set.

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When all values have been read, print out the count of the values, the average, and the standard deviation. The average of a data set {x,...,xn) is x = x/n, where Ex= x ++x, is the sum of the input values. The standard deviation is S= (x; x) n-1