Question: 4. The time between the first and second heart attacks for a certain group of people is an exponential random variable. If 50% of those

4. The time between the first and second heart attacks for a certain group of people is an exponential random variable. If 50% of those who have had a heart attack will have another one within the next five years, what is the probability that a person who had one heart attack five years ago will not have another one in the next five years?

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