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Question

Class mark of a particular class is 6.5 and class size is 3 then class interval is:

A
58
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B
6.59.5
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C
3.56.5
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D
47
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Solution

The correct option is C 58
Let the a be the lower limit of the class interval
Class size of the class interval =3
Upper limit of the class interval=a+3
Class mark=6.5
a+a+32=6.5
2a+3=6,5×2
2a=133
2a=10a=102=5
a+3=5+3=8
Hence class interval= 58

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