Need Help With Programming Assignment

#include <iostream>
#include <cmath>
using namespace std;

float CalstdDeviation(float StoreArr[]);

int main()
{
int i;
float StoreArr[5];
cout << "Enter five(5) elements: ";
for(i = 0; i < 5; ++i)
cin >> StoreArr[i];

cout << endl << "average :" << CalstdDeviation(StoreArr) << endl;

cout << endl <<"The Sample Standard Deviation is = " << CalstdDeviation(StoreArr) << endl;

return 0;
}

float CalstdDeviation(float StoreArr[])
{

float sum = 0.0, mean, average, standardDeviation = 0.0;

int i;

for(i = 0; i < 5; ++i)

sum += StoreArr[i];

mean = sum / 5;
cout << mean << endl;

standardDeviation += pow(StoreArr[i] - mean, 2);
return sqrt(4 - 1 / sum);

return(average = sum / 5);
}

// main

The five numbers entered should be 1, 6, 9, 5, 0. I suppose to have 4.2 as an average and the sample standard deviation is 3.70135. Can some help please?
Currently I am getting the average and the standard deviation twice.
Do not double post. Stick to your previous thread:
https://cplusplus.com/forum/beginner/277049/
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