Use the contingency table to the right to determine the probability of events. a. What is the probability of event A? b. What is the probability of event A'? B B' c. What is the probability of event A and B? A 90 60 d. What is the probability of event A or B? A 80 30 .... . a. The probability of event A is (Type an integer or decimal rounded to three decimal places as needed.)