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Question

The blood groups of 30 students of Class VIII are recorded 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.
By representing this data in a frequency distribution table, find out the most common and the rarest blood group among these students.

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Solution

It can be observed that 9 students have their blood group as A,

6 have their blood group as B,

3 have their blood group as AB

and 12 have their blood group as O.

Therefore, the blood group of 30 students of the class can be represented as follows.



It can be observed clearly that the most common blood group and the rarest blood group among these students is O and AB respectively as 12 students have their blood group as O, and 3 students have their blood group as AB.


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