C programming, Compute the standard deviation of a data set.

#include <math.h>

#include <stdio.h>

float calculateSD(float data[]);

int main() {

    int i;

    float data[10];

    printf("Enter 10 elements: ");

    for (i = 0; i < 10; ++i)

        scanf("%f", &data[i]);

    printf("\nStandard Deviation = %.6f", calculateSD(data));

    return 0;

}

float calculateSD(float data[]) {

    float sum = 0.0, mean, SD = 0.0;

    int i;

    for (i = 0; i < 10; ++i) {

        sum += data[i];

    }

    mean = sum / 10;

    for (i = 0; i < 10; ++i) {

        SD += pow(data[i] - mean, 2);

    }

    return sqrt(SD / 10);

}