The Boston Marathon is the oldest and best-known U.S. marathon. It covers a route from Hopkinton, Massachusetts, to downtown Boston. The distance is approximately 26 miles. Visit the Brase/Brase statistics site at www.cengagebrain.com and find the link to the Boston Marathon. Search the marathon site to find a wealth of information about the history of the race. In particular, the site gives the winning times for the Boston Marathon. They are all over 2 hours. The following data are the minutes over 2 hours for the winning male runners:

(a) Make a stem-and-leaf display for the minutes over 2 hours of the winning times for the years 1961€“1980. Use two lines per stem.
(b) Make a stem-and-leaf display for the minutes over 2 hours of the winning times for the years 1981€“2000. Use two lines per stem.
(c) Interpretation Compare the two distributions. How many times under 15 minutes are in each distribution?

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1961-1980 23 23 18 19 16 1715 22 13 10 18 5 16 13 9 20 14 10 9 12 1981-2000 9 8910 14 7 1 898 11 8 97991079 9