Question

If class mark is 10 and class width is 6then find the class?

Answer 1

given, class mark =10
class width =6

let x be the the lower limit of the class interval

so, x+6 will be the upper limit of the class interval

we know that, class mark = lower limit+upper limit/2


$6 =( (x) + (x + 6)) \div 2$

$6 =( 2x + 6) \div 2$
$12 = 2x + 6$
$2x = 12 - 6$
$2x = 6$
$x = 6 \div 2$
$x = 3$

THEREFORE, THE CLASS INTERVAL IS 3-6