[Baekjoon] 4344

d = float(input())

C = int(d)

for i in range(1, C+1):

    a = []

    a = [int(x) for x in input().split()]

    hab = 0

    for l in range(1, a[0]+1):

        hab = hab + a[l]

    PG = float(hab / a[0])

    Count = 0

    for k in range(1, a[0]+1):

        if a[k] > PG:

            Count = Count + 1

    dab = 0

    dab = '{0:0<.3f}'.format(Count / a[0] * 100)

    print(dab + '%')

    a = [0 for i in range(100)]