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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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