Array: Calculate average from a given array in C

Write a program in c which will calculate average of all values an array 

#include<stdio.h>
#include<conio.h>
main()
{
    int a[100],i,sum=0,average=0,n;
    printf("\n\tIT'S A PROGRAM TO CALCULATE AVERAGE FROM AN ARRAY\n");
    printf("\n\tEnter the array size: ");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
         printf("\nEnter the %d value: ",i);
        scanf("%d",&a[i]);
        sum+=a[i];
        average=sum/a[i];
    }
    printf("\n\tThe average is:");
        printf("%d\n",average);
}