Shell-求平均

Compute the Average

Given

integers, compute their average correct to three decimal places.

Input Format

The first line contains an integer,

.

lines follow, each containing a single integer.

Output Format

Display the average of the

integers, rounded off to three decimal places.

Input Constraints

(

refers to elements of the list of integers for which the average is to be computed)

Sample Input

4

1

2

9

8

Sample Output

5.000

Explanation

The '4' in the first line indicates that there are four integers whose average is to be computed. The average = (1 + 2 + 9 + 8)/4 = 20/4 = 5.000 (correct to three decimal places) Please include the zeroes even if they are redundant (e.g. 0.000 instead of 0).

---

read n
arr=($(cat))
arr=${arr[*]}
printf "%.3f" $(echo $((${arr// /+}))/$n | bc -l)