A survey of drivers in the United States found that 15% never use a cell phone while driving. Suppose that drivers arrive at random at an auto inspection station.
If the inspector checks 10 drivers, what is the probability that at least one driver never uses a cell phone while driving? (Round your answer to the hundredth.)
Suppose the inspector checks 1000 drivers. Use the normal approximation to the binomial distribution to find the approximate probability that at least 13% of these drivers never use a cell phone while driving. (Express your answer with 4 decimal places.)
If the drivers are inspected sequentially as they arrive randomly at the inspection station, what is the probability that the first driver who uses a cell phone while driving is the third driver checked? (Express your answer with 4 decimal places.)
What is the expected number of drivers who must be checked to find the first who never uses a cell phone while driving? (Round to the nearest whole number.)
What is the expected number of drivers who must be checked to find the first driver who uses a cell phone while driving? (Round to the nearest whole number.)
If it costs $5 to question each driver, what is the expected cost and standard deviation of questioning up to and including the first driver who uses a cell phone while driving?
Expected Cost:
Standard deviation:
A survey of drivers in the United States found that 15% never use a cell phone while driving. Suppose that drivers arriv...
Researchers conducted an observational study of automobile drivers and their cell phone use by manually observing traffic in heavily congested areas. They would record the amount of time they observed individual drivers on the phone while operating their vehicle in stop and go traffic and the number of accidents on a particular section of highway over the course of a month. The accompanying graph depict the data they recorded, each point represents a 1 mile section of heavily congested roads....
PROBLEM A Suppose a study of speeding violations and drivers who use cell phones produced the following data: Speeding Violation last year No Speeding Violation last year Used cell phone as driver Did not use cell phone as a driver 280 25 405 45 Total 70 685 Referring to Problem A, , if a random person is selected from this sample, what is the probability that the person used a cell phone as a driver? a) 81.9% b) 90.7% c)...
ons er the following information about travelers on vacation: 40% check work erna. 30% use cell phone to stay connected to work, 35% bring a prop with both check work erna" and use a cell phone to stay connected, and 54.4% neither check work email ror use a cell phone to stay out of every 100 who bring a laptop also check work email, and 70 out of every 100 who use a cell phone to stay connected also bring...
14. In a survey, 161 respondents say that they never use a credit card, 1220 say that they use it sometimes, and 2828 say that they use it frequently. What is the probability that a randomly selected person uses a credit card frequently? Is it unlikely for someone to use a credit card frequently? How are all of these results affected by the fact that the responses were obtained by those who decided to respond to a survey posted on...
Suppose that insurance companies did a survey. They randomly surveyed 410 drivers and found that 300 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part (a) (i) Enter an exact number as an integer, fraction, or decimal. x = (ii) Enter...
A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (The Wall StreetJournal May 5. 2010). In October 2010, Massachusetts enacted a law that forbids cell phone use by drivers under the age of 18. A policy analyst would like to determine whether the law has decreased the proportion of drivers under the age of 18 who use a cell phone. (Y u may f1nd It useful to reference the opproprlete table: z...
A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while dring (The Wall Street Journal, May 5 2010). In October 2010, Massachusetts enacted a law that forbids cell phone use by drivers under the age of 18. A policy analyst would lke to determine whether the law has decreased the proportion of drlvers under the age of 18 who use a cell phone. (You may find It useful to reference the eppropriate table: z...
The Truth about Road RageHave you ever been driving on the high-way and had a crazy driver just zoom by you as if his life is in danger? Doesn’t that just make you angry inside and makes youchase him/her down? If you answered “yes” to my last question I must enlighten you that you have a case of road rage as many others do.The definition for road rage that law enforcement agencies and insurance companies use as stated in the...
1. In a biology class, your final grade is based on several things: a lab score, scores on two major tests and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 25% of your total grade, each major test is worth 22.5% and the final exam is worth 30%. Compute your weighted class average for the following scores: 92 on the lab, 81 on the first major test, 93...
Roger Rolling is a Driver Operator at the Cavalier Air Force Station in North Dakota. The Fire Department at the Cavalier Air Force base is operated by a vendor, Fiore Industries, Inc. Fiore's driver trainer described him as "a very good driver" who "knows the truck [and] knows the job." Rolling has been working as a Driver Operator for Fiore and assigned to Cavalier for ten (10) years Prior to 2018, Rolling had maintained good safety and driving records, with...
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