SOLUTION: The distribution of room and board expenses per year at a four-year college is normally distribute with a mean of $5850 and standard deviation of $1125. Random samples of size 20 a

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Question 1120586: The distribution of room and board expenses per year at a four-year college is normally distribute with a mean of $5850 and standard deviation of $1125. Random samples of size 20 are drawn from this population and the mean of each sample is determined. Which of the following mean expenses would be considered unusual?
a) 5180
b)6180
c)6350
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The standard error is sd/sqrt(n), which is 1125/sqrt(20)=$251.56
b and c wouldn't be common, but a is 2 2/3 sd away from the mean and would be the most unusual.