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

1.	The following table shows the blood groups of 40 students of a class.Blood groupABOABNumber of students119146One student of the class is chosen at random. What is the probability that the chosen student has blood group (i) O? (ii) AB?
Answer» 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

The following table shows the blood groups of 40 students of a class.Blood groupABOABNumber of students119146One student of the class is chosen at random. What is the probability that the chosen student has blood group (i) O? (ii) AB?

Answer»

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

Discussion

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