Midterm 2 of CS70 consists of n questions. Before the test, m TAs are going to beta test the midterm. | Cheap Nursing Papers
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Midterm 2 of CS70 consists of n questions. Before the test, m TAs are going to beta test the midterm.

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(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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