Question

The sixth class interval for a grouped data whose first two class intervals are $10–15\mathrm{and}15–20$ is ______

Answer 1

The difference between upper and lower class limits is called class height or class size or class width of the class interval.

Data can be grouped into class intervals such that all observations in that range belong to that class.

As per the given details the class intervals are

$$\begin{gathered} \mathrm{First}:10-15 \\ \mathrm{Second}:15-20 \\ \mathrm{Third}:20-25 \\ \mathrm{Fourth}:25-30 \\ \mathrm{Fifth}:30-35 \\ \mathrm{Sixth}:35-40 \end{gathered}$$

Hence, The sixth class interval for a grouped data is $35-40$