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2. Say X is the number of days a registered student goes to campus (they are on campus at least 1 day a week). You

2. Say X is the number of days a registered student goes to campus (they are on campus at least 1 day a week). You are given the following pmf table for X, but one of the values is missing (-).

a. Assuming the pmf is a valid one, what is the value of -, the missing value?

b. What is the expected value of X given X is less than or equal to 3?

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