(b) Now each TA is going to choose a question uniformly at random from the n questions to grade (independently of other TAs). Let Y be the number of distinct questions that no one chooses. What is the expectation of Y ? What’s the variance of Y ?
(b) Now each TA is going to choose a question uniformly at random from the n questions to grade (independently of other TAs). Let Y be the number of distinct questions that no one chooses. What is the expectation of Y ? What’s the variance of Y ?
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