# 读入人数
n = int(input())
# 读入成绩列表
scores = list(map(int, input().split()))
# 计算平均分
avg = sum(scores) / n
# 保留两位小数输出
print("{0:.2f}".format(avg))

a = int(input())
b = input().split()
c=0.00
for i in range(a):
    b[i]=int(b[i])
for i in range(a):
    c = float(c+b[i])
    k=c/a
    r = "%.2f" % k
    print(r)