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The blood groups of 36 students of IX class are recorded as follows.

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The blood groups of 36 students of IX class are recorded as follows.

Represent the data in the form of a frequency distribution table. Which is the most common and which is the rarest blood group among these groups ?

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Blood group A B AB O
Frequency 10 9 2 15

From the table, most common group is O and rarest group is AB.

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