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)