Find the class marks of classes 10−25 and 35−55.
Class mark of 10−25
$=\frac{10+25}{2}$
$=\frac{35}{2}$
$=17.5$
Class mark of 35−55
$=\frac{35+55}{2}$
$=\frac{90}{2}$
$=45$
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