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The blood groups of 36 students of IX cl...

The blood groups of 36 students of IX class are record as follows. A, O, A, O, A, B, O, A, B, A, B, O, B, O B, O, O, A, B, O, B, AB, O, A, O, O, O, A, AB, O, A, B, O, A, O, B. Represent the data in the form of a frequency distribution table. Which is most common and which is the rarest blood group among these groups?

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