Question

Calculate the class mark of the given class intervals and match the following.

• A. 22.5
• B. 12.5
• C. 17.5
• D. 7.5

Answer 1

$\left(1\right)Classintervalis5to10.Here,Lowerclasslimit=5Upperclasslimit=10ClassMark=\frac{Upperclasslimit+Lowerclasslimit}{2}$
$=\frac{5+10}{2}$
$=\frac{15}{2}$
$=7.5$
$\left(2\right)Classintervalis10to15.Here,Lowerclasslimit=10Upperclasslimit=15ClassMark=\frac{Upperclasslimit+Lowerclasslimit}{2}$
$=\frac{10+15}{2}$
$=\frac{25}{2}$
$=12.5$
$\left(3\right)Classintervalis15to20.Here,Lowerclasslimit=15Upperclasslimit=20ClassMark=\frac{Upperclasslimit+Lowerclasslimit}{2}$
$=\frac{15+20}{2}$
$=\frac{35}{2}$
$=17.5$
$\left(4\right)Classintervalis20to25.Here,Lowerclasslimit=20Upperclasslimit=25ClassMark=\frac{Upperclasslimit+Lowerclasslimit}{2}$
$=\frac{20+25}{2}$
$=\frac{45}{2}$
$=22.5$