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MetaAfter a five - hour shift watching for speeders on Hwy 7 5 , Officer Scott Turner returned to his station with $ 6 0

MetaAfter a five-hour shift watching for speeders on Hwy 75, Officer Scott Turner returned to his station with
$600 in speeding tickets. His supervisor was upset, since he thought that $600 was unusually low for such a
long shift. Stop spending so much time at the Donut Palace! he says. Scott responded that he was not
wasting time, claiming it was a slow day on the highway.
Fines are determined based on how many miles per hour the driver is over the posted speed limit. The
department policy is to pull over any driver going more that 10 mph over the posted speed limit. Based on
past observations, the department has estimated the percentage of drivers that speed (table below). On a
typical day, a police officer will observe on average one car per minute (inter-car times are an exponential
distribution with rate =1) and it takes on average 30 minutes (exponential distribution with rate =1/30)
to stop a speeder and issue a ticket (no warnings!).
MPH over Speed Limit Fine Percent of Drivers
Less than 10 $090%
11-15 $1007%
16-20 $2002%
More than 20 $3001%
Was Officer Turner telling the truth? Conduct a simulation to estimate the probability of issuing only $600
(or less) in speeding tickets in a five-hour (300 minute) shift. To do this, count what proportion of simulations
have a total ticket value less than or equal to $600.
Note: Occasionally an officer will have to give a ticket in the last 30 minutes of their shift. In this case, he
will give the ticket, even though it means that he will likely be on duty for more that 300 minutes.

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