Sep 30, 2011

C program to input real numbers and find the mean, variance and standard deviation

Write a C program to input real numbers and find the mean, variance and standard deviation.Mean is sum of values divided by the total number of values. Variance shows the how the data s are distributed. Standard deviation is the square root of its variance. Read more about C Programming Language .

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#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;


 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()*/
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