https://www.hackerrank.com/challenges/s10-basic-statistics/problem

mean_median_mode.py

# Enter your code here. Read input from STDIN. Print output to STDOUT

n = int(input())
array = sorted(list(map(int, input().split())))
# print(array)
mean = sum(array) / n

if n % 2 == 0:
    n1 = n//2
    n0 = n1 - 1
    median = (array[n0] + array[n1])/2
else:
    median = array[n//2]

mode = dict()
key = 0
occurrence = -1
for i in array:
    mode[i] = mode.get(i, 0) + 1
    (key, occurrence) = (key, occurrence) if occurrence >= mode[i] else (i, mode[i])
    # print(key, occurrence)


print(round(mean, 1), round(median, 1), key, sep='\n')