Chapter 2.2, Problem 26E

The 2011 Cincinnati Flying Pig Half-Marathon (13.1 miles) had 10,897 finishers (Cincinnati Flying Pig Marathon website). The following data show the ages for a sample of 40 half-marathoners.

49	33	40	37	56
44	46	57	55	32
50	52	43	64	40
46	24	30	37	43
31	43	50	36	61
27	44	35	31	43
52	43	66	31	50
72	26	59	21	47

1. a. Construct a stretched stem-and-leaf display.
2. b. Which age group had the largest number of runners?
3. c. Which age occurred most frequently?