2%の試行が当たるまでの平均試行回数

main.py

#!/usr/bin/env python3

from random import random

def trial(p):
    if random() < p:
        return 1
    else:
        return 1 + trial(p)

def aveTrialCount(count):
    return sum(trial(0.02) for i in range(count)) / count

if __name__ == "__main__":
    print(aveTrialCount(100))