i***q 发帖数: 1095 | 1 【 以下文字转载自 Statistics 讨论区 】
发信人: iamwq (will), 信区: Statistics
标 题: 弱人问个题
发信站: BBS 未名空间站 (Tue Nov 17 13:38:18 2009, 美东)
Suppose that balls are tossed into b bins. Each toss is independent, and
each ball is equally likely to end up in any bin. What is the expected
number of ball tosses before at least one of the bins contains two balls? | z****e 发帖数: 2024 | |
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