computing in c language using function and main program... thank you

a 3-(30p) Write a function that determines standart deviation of float array. The function takes dataset as a float array parameter!! And it also return result as float. (Clue: calculate average first) Definations: N = (xi - 2)2 N - standard deviation xi - each value of dataset X (with a bar over it) - the arithmetic mean of the data (This symbol will be indicated as average of dataset) N - the total number of data points (if you need square root of some number you can use sqrt function in math.h library. Usage example: a-sqrt(b); which means "a" is equal to square root of "b")