Question: 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 0.6 , what is the probability that event b will occur ?
A) 0.05
B) 0.15
C) 0.45
D) 0.5
E) 0.55
Correct answer: C
Grade: 7 | Topic: Statistics and Probability | Difficulty: Easy | Standard: 7.SP.C.6