The probability that a person in the United States has type B+ blood is 13%. Four unrelated people in the United States are selected at random. Complete parts(a) through(d).

a: the probability that all four have type b+ blood is: ? (round to six decimal places)

b: the probability that none of the four have type b+ blood is: ? (round to 3 decimal places)

c: the probability that at least one of the four have type b+ blood is: ? (round to 3 decimal places)

d: Which of the events can be consideredunusual? Explain. Select all that apply.

A.

The event in part(c) is unusual because its probability is less than or equal to 0.05.

B.

The event in part(b) is unusual because its probability is less than or equal to 0.05.

C.

The event in part (a) is unusual because its probability is less than or equal to 0.05

D.

None of these events are unusual