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B
17−22,22.5−27.5,28−32.5,33−37.5,38−42.5,43−47.5
Width of the class is 7
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C
16−23,23−28.5,278−32,32−38,38−43,43−48
Width of the class is 5
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D
None of these
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Solution
The correct option is A17.5−22.5,22.5−27.5,27.5−32.5,32.5−37.5,37.5−42.5,42.5−47.5
Width of the class is 5
If the class marks of a frequency distribution are 20,25,30,35,40 and 45, then the width of the class is 25−20=5. Classes are 17.5−22.5,22.5−27.5,27.5−32.5,32.5−37.5,37.5−42.5,42.5−47.5.