Question

The class mark of class 140 - 150 is​

Answer 1

The class mark of the class 140 - 150 is 145

Given :

The class 140 - 150

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 140 - 150

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 140 - 150

Upper Class boundary = 150

Lower class boundary = 140

Step 3 of 3 :

Find class mark of the class

The class mark of the class

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

$\displaystyle \sf{ = \frac{150 + 140}{2} }$

$\displaystyle \sf{ = \frac{290}{2} }$

$\displaystyle \sf{ = 145}$

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