Question

In a medical examination of students of a class ,the following blood groups are recorded:
Blood group-A AB B O
No.of students-9 14 12 5
A student is selected at random from the class.The probability that he/she has blood group B,is​

Answer 1

Total no. of students = 9+14+12+5 = 40

Probability of the student having blood group B, P(B)

= no. of favourable outcomes/total possible outcomes

= 12/40 = 3/10

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