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A Store Is Offering a Discount on 800 Pairs of Basketball

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A store is offering a discount on 800 pairs of basketball shoes. The amount of the discount varies and is not revealed to the customer until paying for the shoes. The distribution of discounts is given in the below table:
A store is offering a discount on 800 pairs of basketball shoes. The amount of the discount varies and is not revealed to the customer until paying for the shoes. The distribution of discounts is given in the below table:     Use the negative binomial distribution to approximate the average number of pairs of shoes that a customer has to buy before purchasing two pair with a discount of at least 50%.
Use the negative binomial distribution to approximate the average number of pairs of shoes that a customer has to buy before purchasing two pair with a discount of at least 50%.

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On average a customer will buy 5.62 pair...

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