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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. 

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

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detailed solution

For representing the given data in the frequency distribution table we proceed as follows,

First we find each of the blood group occured how many times if A occured 9 times then 9 is the frequency of the blood group A 

Thus, continuing in this way we draw the table of frequency distribution as, 

Blood Group Number of Students ( Frequency)
                                      Total =30

So, the table shows that, 

The most common blood group is with highest frequency which is blood group O

The rarest blood group is with lowest frequency which is blood group AB


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