What is the value to use for the standard error of the mean


A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13.5 mph. what is the value to use for the standard error of the mean ?

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Basic Statistics: What is the value to use for the standard error of the mean
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