It is given that
Total number of students = 40
(i) We know that
Number of students having blood group O = 14
So we get
Required probability = number of students having blood group O/ Total number of students
By substituting the values
Required probability = 14/40 = 0.35
(ii) We know that
Number of students having blood group AB = 6
So we get
Required probability = number of students having blood group AB/ Total number of students
By substituting the values
Required probability = 6/40 = 0.15