Question

the class mark of class interval is 180-190

Answer 1

$class \: mark \: = upper \: + lower \: class \div 2 \\ class \:mark = 190 + 180 \div 2 \\ class \: mark \: = 370 \div 2 \\ class \: mark \: = 185 \:$

Answer 2

Answer:

Class Mark of 180 - 190 is 185

Step-by-step explanation:

Given Class Interval 180 - 190

To find: Class mark

Class mark is defined as the Average of the class limit of a interval.

Class Mark is also known as Mid point of Class interval.

Upper limit of given class interval = 190 &

Lower limit of the given class interval = 180

Class mark can be calculate using following formula,

$Class\:mark=\frac{Upper\:Limit+Lower\Limit}{2}$

So, Class Mark of 180 - 190 = $\frac{190+180}{2}$

                                               = $\frac{370}{2}$

                                               = $185$

Therefore, Class Mark of 180 - 190 is 185