Question

Class mark of class interval 15-25 is

Answer 1

Answer:

Class mark of class interval 15-25 is 20.

Step-by-step explanation:

Lower limit +Upper limit/2

Answer 2

Class mark of class interval 15 - 25 is 20

Given :

Class interval 15 - 25

To find :

Class mark of class interval 15 - 25

Concept :

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 2 :

Write down the given class interval

The given class interval is 15 - 25

Step 2 of 2 :

Find Class mark

Upper Class boundary = 25

Lower class boundary = 15

Hence the required class limit

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

$\displaystyle \sf{ = \frac{25 + 15}{2} }$

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

$\displaystyle \sf{ = 20}$

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