To find the average age

Total time limit:

1000ms

Memory Limit:

65536kB

Describe

There are several students in the class, giving the age of each student (whole number), the average age of all students in the class, and the retention of two decimal places.

Input

The

first line has an integer n (1<= n <= 100) that represents the number of students. The next n rows have 1 integers per row, indicating the age of each student, with a value of 15 to 25.

Output

the output row, which contains a floating-point number, is reserved to two digits after the decimal point for the required average age.

Sample input

21817

Sample output

17.50

Tips

to output floating-point numbers, double-precision digits after the decimal 2 digits, you can use the following form:

printf ("%.2f", num);

Source

2005~2006 Medical Department Calculation Introduction final exam

#include <stdio.h>intMain () {intn,a[101],u,s=0; DoubleAA; scanf ("%d",&N);  for(u=1; u<=n;u++) {scanf ("%d",&A[u]); S=s+A[u]; } AA=(Double) s/N; printf ("%.2LF", AA); return 0;}

To find the average age