Mathematics, 24.04.2020 20:00, lavelma2011

Suppose a bin contains 20 manufactured parts and 4 of them are defective. Pick 3 parts randomly from the bin, with replacement and let X be the number of defective parts picked. Pick parts repeatedly from the bin, with replacement, and let Y be the number of picks until the rst defective part is observed. Find the probability mass functions for X and Y .

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