Question

The blood groups of 30 students of Class X are recorded as follows: A, B, O, O, A, B, 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 these data in the form of a frequency distribution table. Which is the most common, and which is the rarest, blood group among these students?

Answer 1

We can represent the above data as follows:

From the above table, the most common blood group is O and the rarest blood group is AB.