93. The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches. A sample of four metal sheets is randomly selected from a batch. What is the probability that the average length of a sheet is between 30.25 and 30.35 inches long?

AACSB: Analytic SkillsDifficulty: Medium7-27

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Chapter 07 - Sampling Distributions94. The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.3 inches. What is the probability that average length of a steel sheet from a sample of 9 units is more than 29.95 inches long?

AACSB: Analytic SkillsDifficulty: Medium95. The chief chemist for a major oil/gasoline production company claims that the regularunleaded gasoline produced by the company contains on average 4 ounces of a certain ingredient. The chemist further states that the distribution of this ingredient per gallon of regular unleaded gasoline is normal and has a standard deviation of 1.2 ounces. What is the probability of finding an average in excess of 4.3 ounces of this ingredient from randomly inspected 100 gallons of regular unleaded gasoline?

AACSB: Analytic SkillsDifficulty: Medium7-28

Chapter 07 - Sampling Distributions96. The chief chemist for a major oil/gasoline production company claims that the regularunleaded gasoline produced by the company contains on average 4 ounces of a certain ingredient. The chemist further states that the distribution of this ingredient per gallon of regular unleaded gasoline is normal and has a standard deviation of 1.2 ounces. What is the probability of finding an average less than 3.85 ounces of this ingredient from randomly inspected 64 gallons of regular unleaded gasoline? .1587

AACSB: Analytic SkillsDifficulty: Medium97. In the upcoming governor's election, the most recent poll based on 900 respondents predicts that the incumbent will be reelected with 55% of the votes. From the 900 respondents, how many indicated that they would not vote for the current governor or indicated that they were undecided? 405(.45)(900)=405AACSB: Analytic SkillsDifficulty: Easy98. In the upcoming governor's election, the most recent poll based on 900 respondents predicts that the incumbent will be reelected with 55% of the votes. What is ? .0166AACSB: Analytic SkillsDifficulty: Medium7-29

Chapter 07 - Sampling Distributions