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Suppose that we investigate an apple store shop and saw on average that out of 20 customer, 15 of them want to buy the newest

Suppose that we investigate an apple store shop and saw on average that out of 20 customer, 15 of them want to buy the newest iPhone. We select 50 customer randomly, find the probability that (5 point each):

more than 40 customers want to buy the newest iPhone.

Exactly 30 customers want to buy the newest iPhone.

What is the variance on the number of purchased iPhone.

Name the distribution.

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