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Dylan Jones kept careful records of the fuel efficiency of his new car. After the first...

Dylan Jones kept careful records of the fuel efficiency of his new car. After the first six times he filled up the tank, he found the mean was 20.5 miles per gallon (mpg) with a sample standard deviation of 0.6 mpg.

  1. Compute the 90% confidence interval for his mpg. (Use t Distribution Table.) (Round your answers to 3 decimal places.) Confidence interval for his mpg________and_______
  2. How many times should he fill his gas tank to obtain a margin of error below 0.05 mpg? (Use z Distribution Table.) (Round your answer to the next whole number.)
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