Question

The blood groups of 30 students of class iX 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
A student is selected at random from the class from blood donation. Find the probability that the blood group of the student chosen is :
(i) A
(ii) B
(iii) AB
(iv) O

Answer 1

A=9/30=3/10

B=6/30=2/10=1/5

AB=3/30=1/10

O=12/30=4/10=2/5

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Answer 2

Concept: Probability is the study of the chances of events happening.

Required probability = Number of trials in which the event happens/Total number of trials

 

 

Given: The blood groups of 30 students of class iX 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

 

Total numbers of students = 30

(i) Numbers of students having blood group A = 9

Required probability,P(A) = 9/30 = 3/10

P(blood group A) = 3/10 = 0.3

 

(ii) Numbers of students having blood group B = 6

Required probability,P(B) = 6/30 = 2/10

P(blood group B) = 2/10 = 0.2

 

(iii) Numbers of students having blood group AB = 3

Required probability,P(AB) = 3/30 = 1/10

P(blood group AB) = 1/10 = 0.1

 

(iv) Numbers of students having blood group O = 12

Required probability,P(O) = 12/30 = 4/10

P(blood group O) = 4/10 = 0.4

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