SOLUTION: suppose the average age of a passenger train car is 19.3 years. If the distribution of ages is normal and 10% of the cars are older than 22.2 years, find the standard deviation. p
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Question 752357: suppose the average age of a passenger train car is 19.3 years. If the distribution of ages is normal and 10% of the cars are older than 22.2 years, find the standard deviation. please round your final answer to two decimal places.
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Q: suppose the average age of a passenger train car is 19.3 years. If the distribution of ages is normal and 10% of the cars are older than 22.2 years, find the standard deviation. please round your final answer to two decimal places.
------------------------------------------------------------------------
A:
P(X > 22.2) = 0.10
= 0.10
= = 1.282
=
standard deviation, =
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