Question
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
| 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 17 MPG to 26 MPG. |
| (a) | Estimate the standard deviation using Method 3 (the Empirical Rule for a normal distribution). (Round your answer to 4 decimal places.) |
| Standard deviation |
| (b) | What sample size is needed to estimate the mean with 98 percent confidence and an error of 0.25 MPG? (Enter your answer as a whole number (no decimals). Use a z-value taken to three decimal places in your calculations.) |
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Elementary Statisitcs
Authors: Barry Monk
2nd edition
1259345297, 978-0077836351, 77836359, 978-1259295911, 1259295915, 978-1259292484, 1259292487, 978-1259345296
