7.2.3 Range of Grouped Data

Range of Grouped Data (with Class Interval)

Example 2:

The grouped frequency distribution was obtained from 100 students regarding the scores in their test shown as below.

Find the range of the data.

Solution:

\begin{array}{l} Range \\ = midpoint of the highest class - midpoint of the lowest class \\ Range = \frac{35 + 39}{2} - \frac{5 + 9}{2} \\ = 37 - 7 \\ = 30 \end{array}