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Finding the average age of first cardiac incident

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If the age of an initial cardiac incident is normally distributed with a population standard deviation = 12 years, find the average age at which people will experience their first cardiac incident, given that 17% of all initial cardiac incident victims are younger than 50.

I think z =0.5675 = 0.57

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The solution gives detailed steps on finding the average age at which people will experience their first cardiac incident. All formula and calculations are shown and explained.

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We need to find z such that P(Z<z)=0.17. From standard normal table, ...

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