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Question

Look at the following table below.
Class intervalClass mark0551010151520

Fill in the blanks with the class marks of the corresponding class intervals.


A

0, 5

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B

2.5, 7.5

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C

3, 8

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D

5, 10

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Solution

The correct option is B

2.5, 7.5


Class mark for a class interval is given by =Upper class limit + Lower class limit2
For 1st class interval, upper limit is 5 and lower is 0. Thus, class mark will be 2.5.
For 2nd class interval, upper limit is 10 and lower limit is 5. Thus, class mark will be 7.5.


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