题解 | 牛牛的数学作业

T = int(input())                 # 试卷张数
for _ in range(T):
    line_n = int(input()) # 本试卷上数字的个数
    line_a = list(map(int,input().split())) # 本试卷上的数字
    # line_a.sort()
    jicha = max(line_a) - min(line_a)
    sum = 0
    for i in range(line_n):
        sum = sum + line_a[i]
    average = sum / line_n
    fangchahe = 0
    for i in range(line_n):
        fangchahe = fangchahe + (line_a[i] - average) ** 2

    fangcha = fangchahe / line_n
    print(jicha,f"{fangcha:.3f}")

直接硬来