Friday

October 31, 2014

October 31, 2014

Posted by **sasha** on Saturday, January 5, 2013 at 9:13pm.

a. If the inspector checks 10 drivers, what is the probability that at least one driver never uses a cell phone while driving?

b. 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.

c. 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?

d. What is the expected number of drivers who must be checked to find the first who never uses a cell phone while driving?

e. What is the expected number of drivers who must be checked to find the first driver who uses a cell phone while driving?

f. 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?

g. Will the cost of inspection in part f often exceed $15? Explain.

**Answer this Question**

**Related Questions**

stastics - A survey of drivers in the United States found that 15% never use a ...

Math - About 190 million drivers are registered in the United States. While on a...

Stat - 6% of american drivers read the newspaper while driving if 300 drivers ...

drivers ed - I have to do a project and its for my drivers ed class. I chose to ...

Math - The Pew Research Center recently polled n= 1048 U.S drivers andfound that...

Statisics - transportation officials tell us that 80% of drivers wear seat belt ...

statistics - The pew research center recently polled n=1048 u.s. drivers and ...

statistics - The pew research center recently polled n=1048 u.s. drivers and ...

statistics - The pew research center recently polled n=1048 u.s. drivers and ...

Statistics - A research center claims that 50% of people believe that drivers ...