Question
find the class marks of classes 10-25 and 35-55.
✓
Answer
We know that
Class mark $=\frac{\text{Sum of its limits}}{2}$
$\therefore$ Class mark of 10-25 $=\frac{10+25}{2}=\frac{35}{2}=17.5$
and class mark of 35-55 $=\frac{35+55}{2}=\frac{90}{2}=45$
Class mark $=\frac{\text{Sum of its limits}}{2}$
$\therefore$ Class mark of 10-25 $=\frac{10+25}{2}=\frac{35}{2}=17.5$
and class mark of 35-55 $=\frac{35+55}{2}=\frac{90}{2}=45$
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