#include<iostream>
#include<cmath>
#include<fstream>
using namespace std;


int main()
{

 int i;
 int n;
 double temp=0,mean,variance,stddeviation;
 double sum=0;
 double j=0;
 cout<<"请输入数字：";
 cin>>n;
 double *array=new double[n];

 for(i=0;i<n;i++)
 {
  cin>>temp;
  sum=sum+temp;
  *(array+i)=temp;
 }
 mean=sum/n;
 for(i=0;i<n;i++){
  j=j+(array[i]-mean)*(array[i]-mean);
  
  
  
 }
 variance=j/(n-1);        
 stddeviation=sqrt(variance);
 cout<<"mean="<<mean<<endl;
 cout<<"variance="<<variance<<endl;
 cout<<"stddeviation="<<stddeviation<<endl;
 cin.get();
 cin.get();
 return 0;
}

谢谢啦