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