EBK STATISTICS FOR BUSINESS & ECONOMICS
12th Edition
ISBN: 9780100460461
Author: Anderson
Publisher: YUZU
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Chapter 6.2, Problem 25E
According to the Sleep Foundation, the average night’s sleep is 6.8 hours (Fortune, March 20, 2006). Assume the standard deviation is .6 hours and that the
- a. What is the probability that a randomly selected person sleeps more than 8 hours?
- b. What is the probability that a randomly selected person sleeps 6 hours or less?
- c. Doctors suggest getting between 7 and 9 hours of sleep each night. What percentage of the population gets this much sleep?
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Chapter 6 Solutions
EBK STATISTICS FOR BUSINESS & ECONOMICS
Ch. 6.1 - The random variable x is known to be uniformly...Ch. 6.1 - The random variable x is known to be uniformly...Ch. 6.1 - Delta Airlines quotes a flight time of 2 hours, 5...Ch. 6.1 - Prob. 4ECh. 6.1 - The driving distance for the top 100 golfers on...Ch. 6.1 - On average. 30-minute television sitcoms have 22...Ch. 6.1 - Suppose we are interested in bidding on a piece of...Ch. 6.2 - Using Figure 6.4 as a guide, sketch a normal curve...Ch. 6.2 - A random variable is normally distributed with a...Ch. 6.2 - Draw a graph for the standard normal distribution....
Ch. 6.2 - Given that z is a standard normal random variable,...Ch. 6.2 - Given that z is a standard normal random variable,...Ch. 6.2 - Given that z is a standard normal random variable,...Ch. 6.2 - Given that z is a standard normal random variable,...Ch. 6.2 - Given that z is a standard normal random variable,...Ch. 6.2 - Given that z is a standard normal random variable,...Ch. 6.2 - For borrowers with good credit scores, the mean...Ch. 6.2 - The average return for large-cap domestic stock...Ch. 6.2 - In an article about the cost of health care, Money...Ch. 6.2 - The average price for a gallon of gasoline in the...Ch. 6.2 - A person must score in the upper 2% of the...Ch. 6.2 - Television viewing reached a new high when the...Ch. 6.2 - The time needed to complete a final examination in...Ch. 6.2 - Trading volume on the New York Stock Exchange is...Ch. 6.2 - According to the Sleep Foundation, the average...Ch. 6.3 - A binomial probability distribution has p = .20...Ch. 6.3 - Assume a binomial probability distribution has p =...Ch. 6.3 - Although studies continue to show smoking leads to...Ch. 6.3 - An Internal Revenue Oversight Board survey found...Ch. 6.3 - Playing video and computer games is very popular....Ch. 6.3 - A Bureau of National Affairs survey found that 79%...Ch. 6.4 - Consider the following exponential probability...Ch. 6.4 - Consider the following exponential probability...Ch. 6.4 - Battery life between charges for the Motorola...Ch. 6.4 - The time between arrivals of vehicles at a...Ch. 6.4 - Comcast Corporation is the largest cable...Ch. 6.4 - Collinas Italian Caf in Houston, Texas, advertises...Ch. 6.4 - Do interruptions while you are working reduce your...Ch. 6 - A business executive, transferred from Chicago to...Ch. 6 - The NCAA estimates that the yearly value of a full...Ch. 6 - Motorola used the normal distribution to determine...Ch. 6 - During early 2012, economic hardship was...Ch. 6 - Cond Nast Traveler publishes a Gold List of the...Ch. 6 - Ward Doering Auto Sales is considering offering a...Ch. 6 - Is lack of sleep causing traffic fatalities? A...Ch. 6 - Assume that the test scores from a college...Ch. 6 - According to Salary Wizard, the average base...Ch. 6 - A machine fills containers with a particular...Ch. 6 - Consider a multiple-choice examination with 50...Ch. 6 - A blackjack player at a Las Vegas casino learned...Ch. 6 - The Information Systems Audit and Control...Ch. 6 - The website for the Bed and Breakfast Inns of...Ch. 6 - The American Community Survey showed that...Ch. 6 - The time (in minutes) between telephone calls at...Ch. 6 - Specialty Toys Specialty Toys, Inc., sells a...
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