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A man sent email to people and expect a reply, he wont stop until he gets...

A man sent email to people and expect a reply, he wont stop until he gets 5 replies. for each person he sent email to, there is 10% chance that he gets a reply. what is the expect number of email that he will get in a single day?

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Answer #1

Solution :

Given that,

Using binomial distribution,

Expect number of email = 5 * 0.10 = 0.5

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