The probability that a Caucasian person in the United States has type AB- blood is 1%. Four

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The probability that a Caucasian person in the United States has type AB- blood is 1%. Four unrelated Caucasian people in the United States are selected at random. 

(a) Find the probability that all four have type AB- blood.

(b) Find the probability that none of the four have type AB- blood.

(c) Find the probability that at least one of the four has type AB- blood.

(d) Which of the events can be considered unusual? Explain.


Use the Multiplication Rule.

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