The U.S. Department of Transportation reported the number of speeding-related crash fatalities for the 20 days of the year that had the highest number of these fatalities between 1994 and 2003 (Traffic Safety Facts, July 2005).

a. Compute the mean number of speeding-related fatalities for these 20 days.
b. Compute the median number of speeding-related fatalities for these 20 days.
c. 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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Speeding-Related Fatalities Speeding-Related Fatalities 446 436 433 433 431 426 424 Date Jan 1 Jul 4 Aug 12 Nov 23 Jul 3 Dec 26 Aug 4 521 519 466 461 458 455 455 446 446 446 Aug 17 Dec 24 Aug 25 Sep 2 Aug 6 Aug 10 Sept 21 Jul 27 Sep 14 May 27 2 It Aug 31 May 25 422 420 Dec 23