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 ? = 21.50 mpg
and a standard deviation of ? = 2.75 mpg.
(a) What is the standard error of X¯¯¯X¯ , the mean from a random sample of 9 fill-ups by one driver? (Round your answer to 4 decimal places.)
Standard error of X¯¯¯X¯
(b) Within what interval would you expect the sample mean to fall, with 95 percent probability? (Round your answers to 4 decimal places.)
The interval is from to
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