Question

Vancouver Police Response Time Twice That of Other Cities: It takes Vancouver police twice as long to respond to an emergency call as most other police forces in North America. Police here take an average of 11 minutes to respond to priority one calls- crime in progress and serious incidents- compared to 6 minutes in other major cities. Assume that the “priority-one” response time for Vancouver police can be approximated with a Normal model with a mean of 11 minutes and a standard deviation of 3.5 minutes. i. What proportion of the response times is at least 9 minutes but at most 13 minutes? ii. What percentage of the response times is at most 8 minutes? iii. 25% of the response times are longer than how many minutes? b. Suppose that another “major city” claimed that its police force response times followed a normal model with a mean of 6 minutes. What is the SD of this model if 90% of the response times were at most 10 minutes? Show all steps in your solution.

Answer #1

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 10.0 minutes
and a standard deviation of 1.5 minutes. For a randomly received
emergency call, find the following probabilities. (Round your
answers...

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 9.2 minutes
and a standard deviation of 2.1 minutes. For a randomly received
emergency call, find the following probabilities. (Round your
answers...

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 10.0 minutes
and a standard deviation of 1.5 minutes. For a randomly received
emergency call, find the following probabilities. (Round your
answers...

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 10.0 minutes
and a standard deviation of 1.5 minutes. For a randomly received
emergency call, find the following probabilities. (Round your
answers...

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 9.6 minutes
and a standard deviation of 2.3 minutes. For a randomly received
emergency call, find the following probabilities. (Round your
answers...

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 10.0 minutes
and a standard deviation of 1.5 minutes. For a randomly received
emergency call, find the following probabilities. (For each answer,...

Police response time to an emergency call is the difference
between the time the call is first received by the dispatcher and
the time a patrol car radios that it has arrived at the scene. Over
a long period of time, it has been determined that the police
response time has a normal distribution with a mean of 9.6 minutes
and a standard deviation of 2.3 minutes. For a randomly received
emergency call, find the following probabilities. (Round your
answers...

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