Question

Blood Group	Number of Students
A	9
B	6
AB	3
O	12
Total	30

The above frequency distribution table represents the blood groups of 30 students of a class. Use this table to determine the probability that a student of this class, selected at random, has blood group AB.

Answer 1

Number of students having blood group AB = 3

Total number of students = 30

Hence, required probability, `P = 3/30 = 1/10`