Question

What is the class mark of the class interval 40-45

Answer 1

Answer:

class mark=(lower limit +upper limit) /2

40+45/2

85/2

42.5

Answer 2

The class mark of the class interval 40 - 45 is 42.5

Given :

The class interval 40 - 45

To find :

The class mark of the class interval

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 interval

The given class interval is 40 - 45

Step 2 of 3 :

Write down Upper Class boundary & Lower class boundary

For the given class 40 - 45

Upper Class boundary = 45

Lower class boundary = 40

Step 3 of 3 :

Find class mark of the class

The class mark of the class

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

$\displaystyle \sf{ = \frac{45 + 40}{2} }$

$\displaystyle \sf{ = \frac{85}{2} }$

$\displaystyle \sf{ = 42.5}$

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