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Back to 2.7 Measures of the Spread of the Data

2.7 Exercise 22

Avg difficulty 2.5

A selection of countries has poverty rates that range from 11.4% to 74.6%. This data is summarized in Table 14.

Percent of populationNumber of countries
11.4–20.4529
20.45–29.4513
29.45–38.454
38.45–47.450
47.45–56.452
56.45–65.451
65.45–74.450
74.45–83.451

What is the best estimate of the average poverty percentage for these countries? What is the standard deviation for the listed poverty rates? The United States has an average poverty rate of 33.9%. Is this rate above average or below? How “unusual” is the United States’ poverty rate compared to the average rate? Explain.

OpenStax Introductory Business Statistics 2e, 2.7 Measures of the Spread of the Data, exercise 22

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Adapted from Introductory Business Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Business Statistics 2e. Imported at revision 50ec917.