>>> import numpy as np
>>> standart_perc = [50, 75, 80, 85, 90, 95, 98, 99, 100]
>>> a = np.arange(110)
>>> np.percentile(a, standart_perc)
[54.5, 81.75, 87.200000000000003, 92.649999999999991, 98.100000000000009, 103.55, 106.81999999999999, 107.91, 109.0]
54.5 と 81.75、81.75 と 87.200000000000003 などの間の値の割合を計算する方法.. ?