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红色字的求解释,谢谢大神们!
The objects are called the elements of the set. If S is a set having a finite number of elements, then the number of elements is denoted by |S|.
Such a set is often defiined by listing its elements; for example S={-5,0,1} is a set with |S|=3 这个|S|=3 是怎么来的?
20 numbers:
-4 0 0 -3 -2 -1 -1 0 -1 -4 -1 -5 0 -2 0 -5 -2 0 0 -1
它说median=-1 (the average of the 10th and 11th numbers)
可是我第十个跟第十一个数字应该是 -4 和 -1 ,他们的平均数不是-1 啊?
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