9. The blood groups of 30 students of Class VIII are recoded as follows: A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O, A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O. Represent this data in the form of a frequency distribution table.
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blood group frequency
A 9
B 6
O 12
AB 3
A 9
B 6
O 12
AB 3
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