数学概率

jinchen0812 · 发表于 2011-8-4 16:46:21

"one at a time without being replaced" 这是有放回的抽取还是不放回的抽取？

jinchen0812 · 发表于 2011-8-4 19:18:30

自己顶，求帮助啊！

大灵 · 发表于 2011-8-4 19:23:07

LZ给个情境吧···这但单一句话的···让人怎么理解···

jinchen0812 · 发表于 2011-8-4 19:32:41

LZ给个情境吧···这但单一句话的···让人怎么理解···

-- by 会员大灵 (2011/8/4 19:23:07)

A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow.If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?

brendaqian · 发表于 2011-8-4 19:40:20

肯定是不放回啊

chandlerlfh · 发表于 2011-8-4 20:56:45

当然是不放回啦

数学概率

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