Question

what is the
class mark of the class interval 10 -15?​

Answer 1

$\Large{\underline{\underline{\tt{\purple{Answer !!}}}}}$

Class mark =( lower limit + upper limit )/2

Class mark = (10 + 15)/2

Class mark = 25/2

Class mark = 12.5

Answer 2

$\boxed{ \sf{class \: mark = \frac{upper \: limit + lowe r\: limit}{2} }}$

$\mapsto \: \rm \: class \: mark = \frac{15 + 10}{2}$

$\mapsto \rm \: class \: mark = \frac{25}{2}$

or

$\bf{12.5}$