In a medical examination of 40 students of a class, the following blood, groups are recorded:
Blood group | A | B | AB | O |
No of students | 11 | 15 | 9 | 5 |
From this class, a student is chosen at random, What is the probability that the chosen student has blood group B?
Total number students= 40
Number of students with blood group ‘A’ = 11
Number of students with blood group ‘B’ = 15
Number of students with blood group ‘AB’ = 9
Number of students with blood group ‘O’ = 5
Probability P() =
Probability of selecting a student with blood group ‘B’
P(B) = =
=