Question 984220
I'll do the first one to get you started.


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Problem


Salesmen for the ABC Plastics Company drive an average of 240 miles per day with a standard deviation of 36 miles. If samples of 25 daily mileages are taken, what is the standard deviation of the distribution of sample means?
6.8
7.0
7.1
7.2 

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Standard Error = sigma/sqrt(n)
Standard Error = 36/sqrt(25)
Standard Error = 36/5
Standard Error = 7.2


The standard error, aka the standard deviation of the sample means, is <font color="red">7.2</font>