Measures of the Center of the Data · Exercise 8

The countries with the highest rates of obesity in the world have obesity rates that range from 11.4% to 74.6%. This data is summarized in the following table.

$$\begin{array}{cc}\text{Percent of Population}& \text{Number of Countries}\\ \text{11.4–20.45}& \text{29}\\ \text{20.45–29.45}& \text{13}\\ \text{29.45–38.45}& \text{4}\\ \text{38.45–47.45}& \text{0}\\ \text{47.45–56.45}& \text{2}\\ \text{56.45–65.45}& \text{1}\\ \text{65.45–74.45}& \text{0}\\ \text{74.45–83.45}& \text{1}\end{array}$$

(a) What is the best estimate of the average obesity percentage for these countries?
(b) The United States has an average obesity rate of 33.9%. Is this rate above average or below?
(c) How does the United States compare to other countries?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Statistics 2e · §2.5 Measures of the Center of the Data · Exercise 8