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17) You have asked your dad to buy your favourite cereal at the grocery store. There is a 40% chance it is on sale. If

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17) You have asked your dad to buy your favourite cereal at the grocery store. There is a 40% chance it is on sale. If it IS on sale, then you estimate there is an 85% probability that he will buy it. If it is NOT on sale, there is only a 30% probability that he will buy it? Overall, what is the probability that he will buy the cereal? (USE DEPENDENT PROBABILITY NOTATION. You may draw a tree diagram but do not need to.)

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