我得到了正确的输出,但我没有得到正确的方差输出。样本输入为8,10,12,14。
它应该输出均值为11,方差为5.然而,我得到的均值是11,方差是6.66667。
// Include statements
#include <iostream>
#include <cmath>
using namespace std;
// Main function
int main ()
{
// Input values
float n1, n2, n3, n4;
cout << "Enter four numbers:\n";
cin >> n1 >> n2 >> n3 >> n4;
// Calculate mean of 4 values
float mean;
mean = (n1+n2+n3+n4)/4;
// Calculate variance of 4 values
float variance;
float var1 = ((n1-mean)*(n1-mean));
float var2 = ((n2-mean)*(n2-mean));
float var3 = ((n3-mean)*(n3-mean));
float var4 = ((n4-mean)*(n4-mean));
variance = (var1+var2+var3+var4)/3;
// Print the output
cout << "mean = " << mean << endl;
cout << "variance = " << variance << endl;
return 0;
}
答案 0 :(得分:1)
您已将var1+var2+var3+var4
除以3而不是4。