(a) The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages isnormal and 20% of the cars are older than 22.8 years, find the standard deviation.

Answered: (a) The average age of Amtrak passenger…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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(a) The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is normal and 20% of the cars are older than 22.8 years, find the standard deviation.