Question

The class mark of the class 10-30 is​

Answer 1

Answer:

Class mark is the average of upper limit and lower limit of the given class interval.

Therefore, class mark of 10−30 interval is

$\frac{10 + 30}{2} = \frac{40}{2} = 20$

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Answer 2

The class mark of the class 10 - 30 is 20

Given :

The class 10 - 30

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 10 - 30

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 10 - 30

Upper Class boundary = 30

Lower class boundary = 10

Step 3 of 3 :

Find class mark of the class

The class mark of the class

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

$\displaystyle \sf{ = \frac{30 + 10}{2} }$

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

$\displaystyle \sf{ = 20}$

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