HW 2.3

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

}
for (int r=2;r<=4;r++)
{
    for (i=0;i<n;i++)
    {
    t=(a[i]-u);
    t=t*t;
    sum1=sum1+t;
    }
    m=(1/(double)(n))*sum1;
    cout << r <<'=' << m << ' ' << endl;
}
system("pause");
    return 0;
}