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. Find out which is the most common and which is the rarest blood group among these students.

Here 9 students have blood groups A, 6 has B, 3 has AB and 12 has O.


Blood group



No. of students



A



9



B



6



AB



3



O



12




Total = 30



As 12 students have the blood group O and 3 have their blood group AB. Clearly, the most common blood among these students is O and the rarest blood group among these students is AB.


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