Baekjoon 4344번(python)

C = int(input())

student_lists = list()
for _i in range(C):
    student_lists.append(list(map(int, input().split(' '))))

for student_list in student_lists:
    num_of_student = student_list[0]
    mean = sum(student_list[1:]) / num_of_student
    count = 0
    for score in student_list[1:]:
        if(mean < score):
            count += 1
    print('%.3f' % ((count / num_of_student) * 100) + '%')