PAT 2-05. To find the mean variance of the collection data (15)

The mean variance of a given integer is obtained by the title.

The average value needs to be converted to a double type, which can result in an error if no conversion results in a loss of precision.

The code is as follows:

#include <iostream> #include <cmath>using namespace Std;int n;int a[10005];int main () {Cin>>n;int sum= 0;for (int i=1;i<=n;i++) {cin>>a[i];sum+=a[i];} Double avg= (double) sum/n;double sumsquare=0.0;for (int i=1;i<=n;i++) {sumsquare+= (a[i]-avg) * (A[I]-AVG);} printf ("%.5f\n", sqrt (sumsquare*1.0/n)); return 0;}

　　

PAT 2-05. To find the mean variance of the collection data (15)