C Programming Code Examples
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C Program to Calculate the Mean, Variance & Standard Deviation
/* C Program to Calculate the Mean, Variance & Standard Deviation
This C Program calculates the mean, variance & standard deviation. The formula which is used in this program are mean = average of the numbers. variance = (summation( ( Xj - average of numbers) * ( Xj - average of numbers)) ) / Total no of elements. where j = 1 to N here N is the total no of elements. Standard deviation = Squareroot of the variance. */
#include <stdio.h>
#include <math.h>
#define maxsize 10
void main()
{
float x[maxsize];
int j, n;
float average, variance, std_deviation, sum = 0, sum1 = 0;
printf("Enter the value of N \n");
scanf("%d", &n);
printf("Enter %d real numbers \n", n);
for (j = 0; j < n; j++)
{
scanf("%f", &x[j]);
}
/* Compute the sum of all elements */
for (j = 0; j < n; j++)
{
sum = sum + x[j];
}
average = sum / (float)n;
/* Compute variance and standard deviation */
for (j = 0; j < n; j++)
{
sum1 = sum1 + pow((x[j] - average), 2);
}
variance = sum1 / (float)n;
std_deviation = sqrt(variance);
printf("Average of all elements = %.2f\n", average);
printf("variance of all elements = %.2f\n", variance);
printf("Standard deviation = %.2f\n", std_deviation);
}
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