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Question

What is the class mark of the class interval-(80-90)?


A
82.5
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B
90
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C
80
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D
85
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Solution

The correct option is D 85

To calculate the mean of a continuous series, mid points of the various class intervals is taken before calculating the mean which is also called the class mark. For example, if the class interval is 80-90 then before calculating the mean mid point that is the class mark is calculated which is 85. 


Mathematics

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