#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
  int n, k;
  scanf("%d %d", &n, &k);
  int sum = 0;
  for (int i = 0; i < k; ++i) {
    int x;
    scanf("%d", &x);
    sum += x;
  }

  int min = sum - (n - k) * 3;
  int max = sum + (n - k) * 3;
  printf("%.6f %.6f\n", min / (double)n, max / (double)n);


  return 0;
}