Expected number of tickets, Basic Statistics

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Expected number of tickets

For a particular instant lottery, the bettor can determine immediately whether a purchased ticket is a winning ticket. Suppose that the probability of a winning ticket is p=1. 10

a. What is the expected number of tickets that must be purchased in order to find a winning ticket?

b. Find the probability that more than 10 tickets must be purchased to find a winning ticket.

c. Find the probability that exactly 20 tickets must be purchased to find two winning tickets.

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Basic Statistics: Expected number of tickets

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Basic Statistics: Expected number of tickets

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