Question: The city fuel economy of a 2009 Toyota 4Runner 2WD

The city fuel economy of a 2009 Toyota 4Runner 2WD 6 cylinder 4 L automatic 5-speed using regular gas is a normally distributed random variable with a range 16 MPG to 21 MPG.
(a) Estimate the standard deviation using Method 3 (the Empirical Rule for a normal distribution).
(b) What sample size is needed to estimate the mean with 90 percent confidence and an error of ±0.25 MPG?

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  • CreatedAugust 19, 2015
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