6.39 Bidding on eBay You are bidding on four items available on eBay. You think that for...

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6.39 Bidding on eBay You are bidding on four items available on eBay. You think that for each bid, you have a 25%

chance of winning it, and the outcomes of the four bids are independent events. Let X denote the number of winning bids out of the four items you bid on.

a. Explain why the distribution of X can be modeled by the binomial distribution.

b. Find the probability that you win exactly 2 bids.

c. Find the probability that you win 2 bids or fewer.

d. Find the probability that you win more than 2 bids.

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