/* answer to question 19 */

#include<stdio.h>
#include<conio.h>
void main(void)
{
float num, sum=0, mean;
int count=0;

printf("Insert a number:");
scanf("%f",&num);


while(num != -1)
{
	count++;
	sum=sum+num;
	printf("Insert a number:");
	scanf("%f",&num);
	
}



mean=sum/count;

printf("The mean is: %f \n",mean);


	
getch();
}