The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.25. If the probability that either event A or event B occurs is 0.8, what is the probability that event B will occur?	Choices
A) 0.05
B) 0.15
C) 0.45
D) 0.5
E) 0.65
P(A or B) = P (A) + P(B) - p(a n b)   0.8= 0.4 + P(B) - 0.25   P(B) = 0.65   Ans : 0.65
<result>E</result>
The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.25. If the probability that either event A or event B occurs is 0.8, what is the probability that event B will occur?