The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.45. If the probability that either event A or event B occurs is 0.6, what is the probability that event B will occur?	Choices:
A) 0.05  B) 0.15  C) 0.45  D) 0.5  E) 0.55
P(A or B) = P (A) + P(B) - p(a n b)   0.6= 0.4 + P(B) - 0.45   P(B) = 0.55   Ans : 0.55
<result>E</result>
The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.45. If the probability that either event A or event B occurs is 0.6, what is the probability that event B will occur?