Inheritance of blood typeschildren inherit their blood type, Ask an Expert

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Inheritance of blood types

Children inherit their blood type from their parents, with probabilities that re?ect the parents' genetic makeup. Children of Juan and Maria each have probability 1/4 of having blood type A and inherit independently of each other. Juan and Maria plan to have 4 children; let X be the number who have blood type A.

(a) What are n and p in the binomial distribution of X?

(b) Find the probability of each possible value of X, and draw a probability histogram for this distribution.

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