Chapter 5 and 6 Practice Problems

Chapter 5 and 6 Practice Problems - Chapter 5(5.4 Practice...

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Chapter 5 (5.4): Practice Problem Q. Forty percent of the business travelers carry either a cell phone or a laptop ( USA Today , September 12, 2000). In a sample of 15 business travelers, a. What is the probability that three have a cell phone or a laptop? b. What is the probability that 12 of the travelers have neither a cell phone nor a laptop? c. What is the probability that at least three of the travelers have a cell phone or a laptop? d. Find the expectation and variance of the number of business travelers having a cell phone or a laptop. e. Change “forty percent” to “seventy percent” in the problem. Find the probability that five have either a cell phone or a laptop. (do it by using the table.)
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Chapter 6 (6.2): Practice Problems Q1. According to a survey, subscribers to The Wall Street Journal Interactive Edition spend an average of 27 hours per week using the computer at work ( WSJ.com Subscriber Study, 1999). Assume the normal distribution applies and that the standard deviation is 8 hours. a.
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Chapter 5 and 6 Practice Problems - Chapter 5(5.4 Practice...

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