For example 52 we derived the joint pmf of three types of, Ask an Expert

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For Example 5.2, we derived the joint PMF of three types of fax transmissions:

(a) In a group of four faxes, what is the PMF of the number of 3-page faxes?

(b) In a group of four faxes, what is the expected number of 3-page faxes?

(c) Given that there are two 3-page faxes in a group of four, what is the joint PMF of the number of 1-page faxes and the number of 2-page faxes?

(d) Given that there are two 3-page faxes in a group of four, what is the expected number of 1-page faxes?

(e) In a group of four faxes, what is the joint PMF of the number of 1-page faxes and the number of 2-page faxes?

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