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.38 Cost of unleaded fuel. According to the American Automobile Association (AAA), the average cost of a gallon of egular unleaded fuel at gas stations in May 2014 was $3.65 (AAA Fuel Gauge Report). Assume that the standard deviation of such costs is $.15. Suppose that a random sample ofn – 100 gas stations is selected from the population and the cost per gallon of regular unleaded fuel is determined for each. Consider i, the sample mean cost per gallon. a. Calculate u and oi. b. What is the approximate probability that the sample has a mean fuel cost between $3.65 and $3.67? c. What is the approximate probability that the sample has a mean fuel cost that exceeds $3.67?

.38 Cost of unleaded fuel. According to the American Automobile Association (AAA), the average cost of a gallon of egular unleaded fuel at gas stations in May 2014 was $3.65 (AAA Fuel Gauge Report). Assume that the standard deviation of such costs is $.15. Suppose that a random sample ofn – 100 gas stations is selected from the population and the cost per gallon of regular unleaded fuel is determined for each. Consider i, the sample mean cost per gallon. a. Calculate u and oi. b. What is the approximate probability that the sample has a mean fuel cost between $3.65 and $3.67? c. What is the approximate probability that the sample has a mean fuel cost that exceeds $3.67?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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6.38 Cost of unleaded fuel. According to the American Automobile Association (AAA), the average cost of a gallon of regular unleaded fuel at gas stations in May 2014 was $3.65 (AAA Fuel Gauge Report). Assume that the standard deviation of such costs is $.15. Suppose that a random sample of n - 100 gas stations is selected from the population and the cost per gallon of regular unleaded fuel is determined for each. Consider z, the sample mean cost per gallon. a. Calculate aa and ị. b. What is the approximate probability that the sample has a mean fuel cost between $3.65 and $3.67? c. What is the approximate probability that the sample has a mean fuel cost that exceeds $3.67?
Transcribed Image Text:6.38 Cost of unleaded fuel. According to the American Automobile Association (AAA), the average cost of a gallon of regular unleaded fuel at gas stations in May 2014 was $3.65 (AAA Fuel Gauge Report). Assume that the standard deviation of such costs is $.15. Suppose that a random sample of n - 100 gas stations is selected from the population and the cost per gallon of regular unleaded fuel is determined for each. Consider z, the sample mean cost per gallon. a. Calculate aa and ị. b. What is the approximate probability that the sample has a mean fuel cost between $3.65 and $3.67? c. What is the approximate probability that the sample has a mean fuel cost that exceeds $3.67?
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