03. Histogram

n = int(input())
p1 = 0
p2 = 0
p3 = 0
p4 = 0
p5 = 0

for i in range(n):
    p = int(input())
    if p < 200:
        p1 += 1
    elif 200 <= p < 400:
        p2 += 1
    elif 400 <= p < 600:
        p3 += 1
    elif 600 <= p < 800:
        p4 += 1
    else:
        p5 += 1

print(f'{p1 / n * 100:.2f}%')
print(f'{p2 / n * 100:.2f}%')
print(f'{p3 / n * 100:.2f}%')
print(f'{p4 / n * 100:.2f}%')
print(f'{p5 / n * 100:.2f}%')


Решение с list() и тернарен оператор:

parameters = {'p1': 0, 'p2': 0, 'p3': 0, 'p4': 0, 'p5': 0}

n = int(input())

for i in range(n):
    p = int(input())
    parameters['p5' if p >= 800 else 'p4' if p >= 600 else 'p3' if p >= 400 else 'p2' if p >= 200 else 'p1'] += 1

for p in parameters.values():
    print(f'{p / n * 100:.2f}%')