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. a (Clue: calculate average first) Definations: N 1 N O = standard deviation xi = each value of dataset (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")