The number of passes completed by Aaron Rodgers, quarterback for the Minnesota Vikings, was recorded for each of the 15 regular season games that he played in the fall of 2010 (www.ESPN.com):

a. Draw a stem and leaf plot to describe the data.
b. Calculate the mean and standard deviation for Aaron Rodgers' per game pass completions.
c. What proportion of the measurements lie within two standard deviations of the mean?

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