c program to find Variance, Mean, Standard Deviation

C program - How to Find Variance, Mean and Standard Deviation using C

#include <stdio.h>

#include <conio.h>

#include <math.h>

#define MAXSIZE 10

void main()

{

 float x[MAXSIZE];

 int   i, n;

 float avrg, var, SD, sum=0, sum1=0;

 clrscr();

 printf("Enter the value of N\n");

 scanf("%d", &n);

 printf("Enter %d real numbers\n",n);

 for(i=0; i<n; i++)

 {

  scanf("%f", &x[i]);

 }

 /* Compute the sum of all elements */

 for(i=0; i<n; i++)

 {

  sum = sum + x[i];

 }

 avrg = sum /(float ) n;

 /* Compute  varaience  and standard deviation  */

 for(i=0; i<n; i++)

 {

  sum1 = sum1 + pow((x[i] - avrg),2);

 }

 var = sum1 / (float ) n;

 SD = sqrt(var);

 printf("Average of all elements  = %.2f\n", avrg);

 printf("Varience of all elements = %.2f\n", var);

 printf("Standard deviation       = %.2f\n", SD);

}  /*End of main()*/




Output: