In this post, we will write a **C++ program to calculate the standard deviation of a given range**.

## C++ program to calculate the standard deviation of given range.

```
#include<iostream>
#include<conio.h>
#include<math.h>
int main()
{
system("cls");
int i,j,a[10] = {1,2,3,4,5,6,7,8,9,10};
float sd,sum,pr,res,sum1,count,div,res1;
sum = 0;
res = 0;
count = 0;
for(j=1;j<=9;j++)
{
sum = sum+a[j];
pr = a[j]*a[j];
count = count + pr;
res = res + pr;
div = count/10;
sum1 = (sum*sum)/(10*10);
res1 = div-sum1;
sd = sqrt(res1);
std::cout<<a[j]<<"\t"<<pr<<"\t"<<pr-a[j]<<std::endl;
}
std::cout<<"The standard deviation of series = "<<sd;
getch();
return 0;
}
```

### Output

2 4 2 3 9 6 4 16 12 5 25 20 6 36 30 7 49 42 8 64 56 9 81 72 10 100 90 The standard deviation of series = 3.039737

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