Question

Find the class mark of class interval $50-60.$

Answer 1

$\Rightarrow$ $Classmark=\frac{Lowerlimit+Upperlimit}{2}$

$\Rightarrow$ Given class interval is $50-60$

$\Rightarrow$ Lower limit $=50$ and upper limit $=60$

$\therefore$ $Classmark=\frac{50+60}{2}$

$=\frac{110}{2}$

$=55$

$\therefore$ The class mark of class onterval $50-60$ is $55$.