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.

Transcribed Image Text:

= 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