The blood group of 30 students of a class were recorded as under:

Blood Group	A	B	AB	O
No of students	9	11	4	6

If a students of this class is chosen at random, What is the probability that the chosen students has blood group

(i)0? (ii) A? (iii) AB?

(i) O

Total number students= 30

Number of students with blood group ‘A’ = 9

Number of students with blood group ‘B’ = 11

Number of students with blood group ‘AB’ = 4

Number of students with blood group ‘O’ = 6

Probability P() =

(i) Probability of selecting a student with blood group ‘o’

P(B) =

(ii) Probability of selecting a student with blood group ‘A’

P(B) =

(iii) Probability of selecting a student with blood group ‘AB’

P(B) =