题解 | 牛牛的数学作业
牛牛的数学作业
https://www.nowcoder.com/practice/6f5d239c34a7429cb325a3d836abc342
import sys
n = int(input())
for i in range(n):
l = int(input())
a = list(map(int,input().strip().split()))
maxa = max(a)
mina = min(a)
cha = maxa - mina
avg = sum(a)/l
fangcha = sum([(x-avg)**2 for x in a])/l
print(cha,"%.3f"%fangcha)
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