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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

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 = 23.50 mpg and a standard deviation of = 2.50 mpg. (a) What is the standard error of XX , the mean from a random sample of 25 fill-ups by one driver? (Round your answer to 4 decimal places.)

Standard error of X

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