Measures of the Spread of the Data · Exercise 18

gives the percent of children under five considered to be underweight.

$$\begin{array}{cc}\text{Percent of underweight children}& \text{Number of countries}\\ \text{16–21.45}& \text{23}\\ \text{21.45–26.9}& \text{4}\\ \text{26.9–32.35}& \text{9}\\ \text{32.35–37.8}& \text{7}\\ \text{37.8–43.25}& \text{6}\\ \text{43.25–48.7}& \text{1}\end{array}$$
What is the best estimate for the mean percentage of underweight children? What is the standard deviation? Which interval(s) could be considered unusual? Explain.

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

OpenStax, Introductory Business Statistics 2e · §2.7 Measures of the Spread of the Data · Exercise 18