The following table shows the blood groups of 40 students of a class.

Question:

The following table shows the blood groups of 40 students of a class.

One student of the class is chosen at random. What is the probability that the chosen student's blood group is
(i) O?
(ii) AB?

 

Solution:

Total number of students  = 4

(i) Number of students with blood group O = 14

 Let E1 be the event that the selected student's blood group is O.
 
$\therefore$ Required probability $=P\left(E_{1}\right)=\frac{14}{40}=0.35$
 
(ii) Number of students with blood group AB = 6
 
Let E2 be the event that the selected student's blood group is AB.
 
$\therefore$ Required probability $=P\left(E_{2}\right)=\frac{6}{40}=0.15$
 
 
 
 

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