# C Program to Calculate Standard Deviation

This program calculates the standard deviation of 10 data using arrays.

To understand this example, you should have the knowledge of the following C programming topics:

This program calculates the standard deviation of a individual series using arrays. Visit this page to learn about Standard Deviation.

To calculate the standard deviation, `calculateSD()` function is created. The array containing 10 elements is passed to the function and this function calculates the standard deviation and returns it to the `main()` function.

## Example: Program to Calculate Standard Deviation

``````#include <stdio.h>
#include <math.h>

float calculateSD(float data[]);

int main()
{
int i;
float data;

printf("Enter 10 elements: ");
for(i=0; i < 10; ++i)
scanf("%f", &data[i]);

printf("\nStandard Deviation = %.6f", calculateSD(data));

return 0;
}

float calculateSD(float data[])
{
float sum = 0.0, mean, standardDeviation = 0.0;

int i;

for(i=0; i<10; ++i)
{
sum += data[i];
}

mean = sum/10;

for(i=0; i<10; ++i)
standardDeviation += pow(data[i] - mean, 2);

return sqrt(standardDeviation/10);
}
``````

Output

```
Enter 10 elements: 1
2
3
4
5
6
7
8
9
10

Standard Deviation = 2.872281
```