C :

#include <stdio.h>
int n, a, i, t;
int main(void) {
    scanf("%d", &n);
    for (i = 1; i <= n; i++) {
        scanf("%d", &a);
        t += a;
    }
    printf("%d\n%.1f\n", t, t * 1.0 / n);
    return 0;
}

C++ :

#include<iostream>

#include<cstdio>

using namespace std;

int main()
{
	int n,a;
	double s;
	cin>>n;
	s=0;
	for (int i=1;i<=n;i++)
	{
		cin>>a;
		s=s+a;
	}
	cout<<s<<endl;
	printf("%.1lf",s/n);
	return 0;
}

Python :

# coding=utf-8
t = 0
n = int(input())
s = input(). split()
for i in range(0, n) :
    t = t + int(s[i])
print(t, format(t / n, ".1f"), sep = '\n')