Find the class-marks of the classes 10-25 and 35-55.
✓
Answer
Class mark = $\frac{\text{Upper limit+Lower limits}}{2}$
$\therefore$ Class mark of $10-25 =\frac{10+25}{2} = 17.5$
And class mark of $35-55 = \frac{35+55}{2} = 45$
class mark = 17.5, 45
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