Question

Find the class marks of classes 10−25 and 35−55. [CBSE 2008]

Answer 1

Class mark = $\frac{\mathrm{Upper}\mathrm{limit}+\mathrm{Lower}\mathrm{limit}}{2}$

∴ class mark of 10−25 = $\frac{10+25}{2}$
= 17.5

and class mark of 35−55 = $\frac{35+55}{2}$
= 45