Jim  figures that it takes an average of 17 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to an early morning class.  One day it took rod 21 minutes to get to class. How many standard deviations from the average is that? Is the z value positive or negative?  What communing time corresponds to a standard deviation score of z =-2.5? Could Rod count on making it to class in this amount of time or less?

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