#include <stdio.h>
#include <math.h>

void readData(int *)
{
    printf("Enter 5 values in numerical order: \n");
    scanf("%d", &array[0]);
    scanf("%d", &array[1]);
    scanf("%d", &array[2]);
    scanf("%d", &array[3]);
    scanf("%d", &array[4]);
}
double findMean(int *)
{
    double mean = ((array[0]+array[1]+array[2]+array[3]+array[4])/5);
    return mean;
}
double findVariance(int *, double)
{
    double variance = (pow(array[0]-mean, 2)+pow(array[1]-mean, 2)+pow(array[2]-mean, 2)+pow(array[3]-mean, 2)+pow(array[4]-mean, 2);
}
void printResults(double, double, double)
{
    printf("%lf", array[2]);
    printf("%lf", variance);
    printf("%lf", mean);
}
int main()
{
    int array[5];
    readData(array);
    double mean, variance, stddev;
    mean = findMean(array);
    variance = findVariance(array, mean);
    stddev = sqrt(variance);
    printResults(mean, variance, stddev);
    return 0;
}