Measures of the Center of the Data · Example 4

A frequency table displaying professor Blount’s last statistic test is shown. Find the best estimate of the class mean.

$$\begin{array}{cc}\text{Grade Interval}& \text{Number of Students}\\ \text{50–56.5}& \text{1}\\ \text{56.5–62.5}& \text{0}\\ \text{62.5–68.5}& \text{4}\\ \text{68.5–74.5}& \text{4}\\ \text{74.5–80.5}& \text{2}\\ \text{80.5–86.5}& \text{3}\\ \text{86.5–92.5}& \text{4}\\ \text{92.5–98.5}& \text{1}\end{array}$$

OpenStax, Introductory Statistics 2e · §2.5 Measures of the Center of the Data · Example 4