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A teacher wishes to group test marks (out of 100) of her class into continuous class intervals each of width 10, starting from 0.
Which of the following sets of class intervals is correct (exclusive method)?

Class 9Collection and Presentation of DataStatistics and Probability
  • A0-10, 10-20, 20-30, 30-40, ...
  • B0-9, 10-19, 20-29, 30-39, ...
  • C0-10, 11-20, 21-30, ...
  • D1-10, 11-20, 21-30, ...

Step-by-Step Solution

Width-10 continuous (exclusive) classes share boundaries: 0-10, 10-20, 20-30, etc.
Answer: A) 0-10, 10-20, 20-30, 30-40, ...

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