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A sample of 45 police officers in a suburban department had a mean service time of...

A sample of 45 police officers in a suburban department had a mean service time of 14.2 years with a σn-1 = 5.1 years.

What is μx (mean of the sample)?

The σx (standard deviation of the sample) is?

A service time of 15 years would have a z-score value of?

What % of the time would another sample of size 45 police officers have a mean service time of more than 14 years?

What % of the time would the average for the service time for all police officers be less than 12 years?

What % of the time would another sample of 45 police officers have an average service time of between 13 and 15.5 years?

Math   Statistics-And-Probability   
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