For Exercise 1.33, see page 24; for 1.34 and 1.35, see page 25; for 1.36 to 1.38, see page 26; for 1.39, see page 27; for 1.40 to 1.42, see pages 30-31; for 1.43, see page 32; and for 1.44 and 1.45, see page 33.

Question 1.45

1.45 Calls to a customer service center.

We displayed the distribution of the lengths of 80 calls to a customer service center in Figure 1.14 (page 29).

  1. Compute the mean and the standard deviation for these 80 calls (the data are given in Table 1.1, page 14).
  2. Find the five-number summary.
  3. Which summary does a better job of describing the distribution of these calls? Give reasons for your answer.

1.45

(a) . (b) . (c) The five-number summary is a better summary because the distribution is heavily skewed and has potential outliers.

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