Question

Write the class-size of $10-19,20-29,30-39$

Answer 1

Find the class size

Calculation of True Class Limits:

Lower Class Limit $\left(LCL\right)$	$10-0.5=9.5$	$20-0.5=19.5$	$30-0.5=29.5$
Upper Class Limit $\left(UCL\right)$	$19+0.5=19.5$	$29+0.5=29.5$	$39+0.5=39.5$

Calculating the Class size $=UpperClassLimit-LowerClassLimit$

$$\begin{gathered} 19.5-9.5=10 \\ 29.5-19.5=10 \\ 39.5-29.5=10 \end{gathered}$$

Therefore, the class size is $10$.