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发帖数: 708 | 1 【 以下文字转载自 Statistics 讨论区 】
【 原文由 vianna 所发表 】
a collectino of 100 items from a manufacturing process is known to contain
10 defectives iterms. a sample of 5 items is randomly selected from this
collection of 100 items.
1) what is the probabillity that the sample contains two defectives, if
the sampling is done with replacement?
2) suppose that sampling is done until two defective items are found, what is
the probability that it took N samples to obtain these two defective items,
if sampling is d |
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