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Question

The class mark of a particular class is 17.5 and the class size is 5. The class interval is:

A
1419
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B
1520
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C
14.519.5
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D
17.522.5
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Solution

The correct option is B 1520
Class mark = lower limit+upper limit2
Thus, lower limit + upper limit =35 ....(1)
and Class interval = upper limit lower limit
Thus, upper limit lower limit =5 .....(2)
Adding (1) and (2), we get
2 (upper limit) =40
Upper limit =20
Hence, lower limit =15
Thus, class interval is 1520.

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