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According to an automobile​ association, the average cost of a gallon of regular unleaded fuel at...

According to an automobile​ association, the average cost of a gallon of regular unleaded fuel at gas stations in a certain month was ​$2.834. Assume that the standard deviation of such costs is ​$0.15. Suppose that a random sample of nequals100 gas stations is selected from the population and the​ month's cost per gallon of regular unleaded fuel is determined for each. What is the approximate probability that the sample has a mean fuel cost between​ $2.84 and​ $2.86? (four decimal places as needed.)

Math   Statistics-And-Probability   
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Answer #1

Refer Standard normal table/Z-table to find the probability or use excel formula "=NORM.S.DIST(1.73, TRUE)" & "=NORM.S.DIST(0.40, TRUE)" to find the probability.

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