Question

find the class mark of class 150-160​

Answer 1

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__150 + 160 = 310

___Now classmark = 310/2

___155

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Answer 2

The class mark of the class 150 - 160 is 155

Given :

The class 150 - 160

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 150 - 160

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 150 - 160

Upper Class boundary = 160

Lower class boundary = 150

Step 3 of 3 :

Find class mark of the class

The class mark of the class

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

$\displaystyle \sf{ = \frac{160 + 150}{2} }$

$\displaystyle \sf{ = \frac{310}{2} }$

$\displaystyle \sf{ = 155}$

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