Chapter 1.4, Problem 55E

Here is a stem-and-leaf display of the escape time data introduced in Exercise 36 of this chapter.

32	55
33	49
34
35	6699
36	34469
37	03345
38	9
39	2347
40	23
41
42	4

1. a. Determine the value of the fourth spread.
2. b. Are there any outliers in the sample? Any extreme outliers?
3. c. Construct a boxplot and comment on its features.
4. d. By how much could the largest observation, currently 424, be decreased without affecting the value of the fourth spread?