Question: An environmental group at a local college is conducting independent tests to determine the distance a particular make of automobile will travel while consuming only 1 gallon of gas. A sample of five cars is tested and a mean of 28.2 miles is obtained. How many cars should the environmental group test if they wish to estimate μ, mean miles per 1 gallon, to within 0.5 miles and be 99% confident?

1. 25
2. 124
3. 194
4. 618
5. 619

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