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- #include <iostream>
- using namespace std;
- int main(){
- cout.setf(ios::fixed);
- cout.precision(2);
- int n;
- double num, primerSumatori=0, segonSumatori=0;
- cin>>n;
- for(int i=0;i<n;++i){
- cin>>num;
- primerSumatori=primerSumatori+(num*num);
- segonSumatori=segonSumatori+num;
- }
- cout<<((1.0/(n-1))*primerSumatori)-((1.0/(n*(n-1))*segonSumatori*segonSumatori))<<endl;
- }
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