Question
The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with
The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of = 22.25mpg and a standard deviation of = 1.50mpg.
(a)What is the standard error ofX
X, the mean from a random sample of 36 fill-ups by one driver?(Round your answer to 4 decimal places.)
Standard error ofX
X
(b)Within what interval would you expect the sample mean to fall, with 99 percent probability?(Round your answers to 4 decimal places.)
The interval is fromto
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Quantitative Analysis For Management
Authors: Barry Render, Ralph M. Stair, Michael E. Hanna
11th Edition
9780132997621, 132149117, 132997622, 978-0132149112
