What is the average of the squares of n natural numbers?

Given a number n, we need to find the average of the squares of natural numbers up to n. To do this, we first find the square of all numbers less than or equal to n. Then we add up all these squares and divide them by n. The Chinese translation of

Input 3
Output 4.666667

Explanation

is:

Explanation

12 + 22 + 32 = 1 + 4 + 9 = 14
14/3 = 4.666667

Example

The Chinese translation is:

Example

#include<iostream>
using namespace std;
int main() {
   long n , i, sum=0 ,d;
   n=3;
   for(i=1;i<=n;++i) {
      d=i*i;
      sum+=d;
   }
   cout<<sum/n;
   return 0;
}

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