Question

find the class mark of 10 - 20​

Answer 1

$\bold{Solution}$

$\boxed{classmark=upperlimit+lowerlimit/2}$

using it,

Given,

upper limit=10

Iower limit=20

Class. mark

=> 10 + 20/2

or, = 30/2

or, = 15

$\boxed{classmark=15}$

Answer 2

Given:

Class interval =  10-20

To Find:

find the class mark

Solution:

Class Mark:

It is the average of the upper limit and lower limit of the class or we can say that it is the middle value of the class interval.

Upper limit= 20

Lower limit= 10

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

                 = (20 +10)/2

                 =15

Hence the class mark of the class (10-20) is 15.