#include <stdio.h>


int main(void) 
{
	double arr1[] = {5.2,9.3,6.5,4.1,7.8};
	double sum = 0;
	double average = 0;
	
	for(int i = 0; i < 5; i++)
{
	sum = sum + arr1[i];
	printf("arr1[%d] = %.2lf, sum = %.2lf\n",
			i, arr1[i], sum);
}			
	average = sum / 5;
	
	printf("average: %.2lf\n", average);
	return 0;
}