A stem-and-leaf plot for the numbers of touchdowns allowed by all 128 NCAA Division I Football Bowl Subdivision teams in the 2016–2017 season is shown. Find the probability that a team chosen at random allowed 

(a) At least 51 touchdowns, 

(b) Between 20 and 30 touchdowns, inclusive, and 

(c) More than 63 touchdowns. Are any of these events unusual? Explain.

= 16 Key: 1|6 6. 2 122 3 4 7 88 3 0013 3 3 3 4 4 4 5 5 5 6 6 77777777888 9999 9 4 00 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 5 5 5 6 6 6 6 7 77 8888 8 99 99 0 00 00 1 1 2 2 2 3 3 33 4 4 4 4 4 55 5 6 6 6 8 8 9 9 0 00 111 2 2 2 3 3 3 77 88