Question: Every time you go to a store there is a 15% chance you buy something. What is the probability after going 3 times that you

Every time you go to a store there is a 15% chance you buy something. What is the probability after going 3 times that you do not buy a pastry on any visit?

what is the probability you buy a pastry by the fourth visit?

how many pastries would you expect to buy if you went to the store 100 times? Explain.

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