Question

The class mark of class 20-40 is

Answer 1

Heya !!!

Here is your answer.

Class mark = (Upper limit + lower limit) × 1/2
Here,
Upper Limit = 40
and Lower Limit = 20.

So,

Class mark =
$\frac{40 + 20}{2} = \frac{60}{2}$
= 30.

Hence, the class mark or mid value of 20-40 is 30.

Hope You Got It

Answer 2

The class mark of the class 20 - 40 is 30

Given :

The class 20 - 40

To find :

The class mark of the class

Concept :

Class Mark :

For any grouped frequency table with class intervals, the middle value of the class limits or the class boundaries of any class is called class mark of the class

Solution :

Step 1 of 3 :

Write down the given class

The given class is 20 - 40

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 20 - 40

Upper Class boundary = 40

Lower class boundary = 20

Step 3 of 3 :

Find class mark of the class

The class mark of the class

$\displaystyle \sf{ = \frac{Upper \: Class \: boundary + Lower \: class \: boundary }{2} }$

$\displaystyle \sf{ = \frac{40 + 20}{2} }$

$\displaystyle \sf{ = \frac{60}{2} }$

$\displaystyle \sf{ = 30}$

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