Question

what is class mark of the class 10-19.

Answer 1

class mark= upper class+lower class÷2
10+19/2

29/2
14.5

Answer 2

The class mark of the class 10 - 19 is 14.5

Given :

The class 10 - 19

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 - 19

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 10 - 19

Upper Class boundary = 19

Lower class boundary = 10

Step 3 of 3 :

Find class mark of the class

The class mark of the class

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

$\displaystyle \sf{ = \frac{19 + 10}{2} }$

$\displaystyle \sf{ = \frac{29}{2} }$

$\displaystyle \sf{ = 14.5}$

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