NCERT Solutions
Class 9 Maths
Probability

Ex.15.1 Q.13
In Q.1, Exercise 14.2, you were asked to prepare a frequency distribution table
regarding 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.
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.
Total number of students = 30
P (a student has blood group AB)
= No. of students which have the blood group AB/Total no. of students
=
=