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?

The frequency refers to the number of students having common blood group. We will represent the data in table:


BLOOD GROUP



NUMBER OF STUDENTS (FREQUENCY)



A



9



B



6



O



12



AB



3



Total



30



Most common blood group (Highest frequency) = O


Rarest blood group (Lowest frequency) = AB


6