[old] Median [old] Median
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中位数是一个可将数值集合划分为相等的上下两部分的一个数值。如果列表数据的个数是奇数,则列表中间那个数据就是列表数据的中位数;如果列表数据的个数是偶数,则列表中间那2个数据的算术平均值就是列表数据的中位数。在这个任务里,你将得到一个含有自然数的非空数组(X)。你必须把它分成上下两部分,找到中位数。 ...


数组的中位数(int, float).

median([1, 2, 3, 4, 5]) == 3
median([3, 1, 2, 5, 3]) == 3
median([1, 300, 2, 200, 1]) == 2
median([3, 6, 20, 99, 10, 15]) == 12.5

中位数在概率论和统计学中得到应用,它偏态分布中有显著的价值。例如:我们想从一组数据中知道人们的平均财富 -- 100人一个月收入100美元,10人一个月收入1,000,000美元。如果我们算平均值,得到的是91000美元。这是一个完全没有向我们展示真实情况的奇怪的值。所以在这种情况下,中位数会给我们更有用的值和较好的描述。

1 < len(data) ≤ 1000
all(0 ≤ x < 10 ** 6 for x in data)

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