The probability that a person in the United States has type

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The probability that a person in the United States has type B+ blood is 13%. Five unrelated people in the United States are selected at random.

A: Find the probability that all five have B+ blood.

B: Find the probability that none of the five have type B+ blood.

C: Find the probability that at least one of five has B+ blood.

Which of the events can be considered unusual?

a: the event in part A is unusual because its probability is less than or equal to 0.05

b: None are unusual

c: The event in part C is unusual

b: The event in part B is unusual

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