Suppose we know that the average wage in the fast food industry is $10/hour and that the standard deviation is $4/hour.  Suppose, furthermore, that we are interested in determining if McDonalds is systematically underpaying its workers.  Accordingly, we survey a sample of 100 McDonalds franchises and find that the average wage in the same is $9.50/hour.   What is the probability that a random sample of any 100 restaurants int he fast food sector would produce a sample average of $9.50/hour or less?

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