MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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 u = 25.50 mpg and a standard deviation of o = 2.25 mpg.
(a) What is the standard error of X , the mean from a random sample of 25 fill-ups by one driver? (Round your answer to 4 decimal
places.)
Standard error of X
0.4500
(b) Within what interval would you expect the sample mean to fall, with 98 percent probability? (Round your answers to 4 decimal
places.)
The interval is from
to
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Transcribed Image Text: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 u = 25.50 mpg and a standard deviation of o = 2.25 mpg. (a) What is the standard error of X , the mean from a random sample of 25 fill-ups by one driver? (Round your answer to 4 decimal places.) Standard error of X 0.4500 (b) Within what interval would you expect the sample mean to fall, with 98 percent probability? (Round your answers to 4 decimal places.) The interval is from to
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