HW 2.2

#include <iostream>
using namespace std;
int main()
{
    const int n=5;
    int a[n]={1,2,3,4,5},i,sum=0,sum1=0;
    double s2,u,t;
for (i=0;i<n;i++)
{
    sum=a[i]+sum;
    u=(1/(double)n)*sum;

}
for (i=0;i<n;i++)
{
    t=(a[i]-u);
    sum1=sum1+t*t;
    s2=(1/(double)(n-1))*sum1;
}
cout<<"S^2= "<<s2;
system("pause");
    return 0;
}