According to AAA regular gasoline averaged 3 68 per gallon
According to AAA, regular gasoline averaged $ 3.68 per gallon in the United States in March 2013. Assume the standard deviation for gasoline prices is $ 0.12 per gallon. A random sample of 30 service stations was selected.
a. What is the probability that the sample mean will be less than $ 3.66?
b. What is the probability that the sample mean will be more than $ 3.63?
c. What is the probability that the sample mean will be between $ 3.62 and $ 3.72?
d. Suppose the sample mean is $ 3.75. Does this result support the findings of AAA? Explain your answer.
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