将两个硬币抛10次,每次的结果中背面朝上的硬币数目分别为{0,1,2,2,1,1,0,2,1}
然后问你这些数据的平均值为多少
明白否?就是每抛一次,这两个硬币都有0个、1个或2个是背面朝上的
英语翻译【The number of tails showing when a pair of coins was to
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