The U. S. Department of Transportation reported the number of speed- related crash fatalities for the 20 dates that had the highest number of these fatalities between 1994 and 2003 (Traffic Safety Facts, July 2005).
a. Compute and interpret the mean and standard deviation for this data set.

b. Explain why it is not reasonable to generalize from this sample of 20 days to the other 345 days of the year.

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