In a certain population, the proportion of people having blood of types O, A, B and AB are 42%, 28%, 18% and 12% respectively. If blood samples are taken from four people, what probability would you give to the proposition that they are all of different types?
Answers
Given : the proportion of people having blood of types O, A, B and AB are 42%, 28%, 18% and 12% respectively . blood samples are taken from four people
To Find : probability to the proposition that they are all of different types
Solution:
Probability O = 0.42
Probability A = 0.28
Probability B = 0.18
Probability AB = 0.12
probability they are all of different types = P(O).P(A).P(B).P(AB)
= 0.42 x 0.28 x 0.18 x 0.12
= 0.00254
probability to the proposition that they are all of different types
= 0.00254
= 0.254 %
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