Ages of Passenger Cars The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 7% of the cars are older than 21.3 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. X

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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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 7% of the cars are older than 21.3 years, find the standard deviation. Round z-value calculations to 2 decimal places and final answer to 2 decimal places.

[Input Box]

The standard deviation must be ☐ years.

[Reset Button]

Explanation: This exercise involves calculating the standard deviation of a normally distributed dataset. Given the mean age and the percentage of cars older than a specific age, use the properties of the normal distribution and z-scores to find the standard deviation.
Transcribed Image Text:**Ages of Passenger Cars** The average age of passenger train cars is 19.4 years. If the distribution of ages is normal and 7% of the cars are older than 21.3 years, find the standard deviation. Round z-value calculations to 2 decimal places and final answer to 2 decimal places. [Input Box] The standard deviation must be ☐ years. [Reset Button] Explanation: This exercise involves calculating the standard deviation of a normally distributed dataset. Given the mean age and the percentage of cars older than a specific age, use the properties of the normal distribution and z-scores to find the standard deviation.
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