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Question

The class - mark of class interval 10-15 is _____________


A

12.5

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B

11.5

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C

12

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D

25

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Solution

The correct option is A

12.5


The class mark of the interval is the value midway between the acutal lower limit and the actual upper limit.

In the given class interval , the lower limit = 10

And the upper limit = 15

Hence the class mark = 10+152

= 252

= 12.5


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