An Environmental Group at a Local College Is Conducting Independent $\mu$

question 113

Multiple Choice

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 $\mu$ ,mean miles per 1 gallon,to within 0.5 miles and be 99% confident? Assume a population standard deviation of 2.7 miles.

• A)25
• B)124
• C)194
• D)618
• E)619