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Question 9 of 15 (1 point) | Attempt 1 of 1 | (@ 3h 17m Remaining 6.2 Section Exercise 24 Ages of Passenger Cars The

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Question 9 of 15 (1 point) | Attempt 1 of 1 | (@ 3h 17m Remaining 6.2 Section Exercise 24 Ages of Passenger Cars The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 25% of olo the cars are older than 23.0 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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