计蒜客：求平均年龄Python方法

题目链接：https://nanti.jisuanke.com/t/T1050
用到print字符串小数点方法

n = int(input())
stus = []
num = 0
for i in range(0, n):
    temp = int(input())
    stus.append(temp)
    num += temp
    pass
print("%.2f"%(num / n))