Question

class mark of the class interval 20-40 will be

Answer 1

Answer:

Step-by-step explanation:

cm= lower limit + upper limit/2

l=20      u=40

=20 +40/2

=60/2

=30

Answer 2

The class mark of the class interval 20 - 40 is 30

Given :

The class interval 20 - 40

To find :

The class mark of the class interval

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 interval is 20 - 40

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class interval 20 - 40

Upper Class boundary = 40

Lower class boundary = 20

Step 3 of 3 :

Find class mark of the class interval

The class mark of the class interval

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

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

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

$\displaystyle \sf{ = 30}$

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