Give a program in C to print the mean and standard deviation of a set of values?

I don't remember what needs to be included for the function "sqrt", but this function looks right to me...didn't try it, but should only need a few changes if any.





double float stddev (float* set, int set_length)


{


int i;


float mean = 0.0;


double float sigma = 0.0;





for (i = 0; i %26lt; set_length; i++)


{


mean += (set[i] / (float) set_length);


}





for (i = 0; i %26lt; set_length; i++)


{


float diff = set[i] - mean;


sigma += (diff * diff);


}





sigma = (sigma / (float) set_length);


return sqrt(sigma);


}