## 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;

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()*/```
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