Nfl data from the 2006 football season reported the number, Ask an Expert

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NFL data from the 2006 football season reported the number of yards gained by each of the league's 167 wide receivers:

214_Figure 4.jpg

The mean is 435 yards, with a standard deviation of 384 yards.

a) According to the Normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards?

b) For these data, what does that mean?

c) Explain the problem in using a Normal model for these data.

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