259201 Lab9.3

#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    int n,sum = 0;

    cout<<"How many students? ";
    cin>>n;

    float score[n];
    for( int i = 0 ; i < n ; i++ )
    {
        cin>>score[i];
        sum += score[i];
    }

    float avg,sigma;
    avg = sum/n;

    for( int j = 0 ; j < n ; j++ )
    {
        sigma += pow(score[j] - avg , 2);
    }

    cout<<"SD = "<<sqrt(sigma/n);
}