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
Answers
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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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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