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Ages of Passenger Cars The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 12% of the

Ages of Passenger Cars The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 12% of the cars are older than 23.1 years, find the standard deviation. Round z-value calculations to 2 decimal places and final answer to 2 decimal places. The standard deviation must be years

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