If A and B are any two events with P(A) = .3 and P(BIA) = .5, then the joint probability of A and B is: O 0.15 O 1.5 O 0.8 O 0.6
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- Cathy is planning to take the Certified Public Accountant Examination (CPA exam). Records kept by the college of business from which she graduated indicate that 70% of students who graduated pass the CPA exam. Assume that the exam is changed each time it is given. Let n = 1, 2, 3, ... represent the number of times a person takes the CPA exam until the first pass. (Assume the trials are independent.) (a) What is the probability that Cathy passes the CPA on the first try? (Use 2 decimal places.) (b) What is the probability that Cathy passes the CPA exam on the second or third try? (Use 4 decimal places.)A pair of fair four-sided dice is thrown. The probability that If the two numbers appearing are different is: 12/36 5/36 4/16 7/30Peter fails quizzes with probability 1/4, independent of other quizzes. What is the probability that the second and third time Dave fails a quiz will occur when he takes his eight and ninth quizzes respectively?
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- When sent a questionnaire, 50% of the recipients respond immediately. Of those who do not respond immediately, 60% respond when sent a follow-up letter. If the questionnaire is sent to 4 persons and a follow-up letter is sent to any of the 4 who do not respond immediately, what is the probability that at least 3 never respond? A D E (0.2) 4 + 4.(0.2) ³. (0.8) (0.2)4 + 4.(0.2).(0.8)³ (0.4) 4 + 4C (0.4) ³. (0.6) (0.9)4 + 4.(0.9) ³. (0.1) 4.(0.2) ³ (0.8)The probability that a patient recovers from a rare blood disease is 0.4. If 15 people are known to have contracted this disease, what is the probability that (a) at least 10 survive, (b) from 3 to 8 survive, and (c) exactly 5 survive?A bag contains six red balls, four blue balls and twoyellow balls. If two balls are drawn at random withoutreplacement, the probability that one ball will be red andthe other will be blue is(a) 0.364 (b) 0.333 (c) 0.182 (d) none of these.
- The probabilities that a service station will pump gas into 0, 1, 2, 3, 4, or 5 or more cars during a certain 30 – minute period are 0.03, 0.18, 0.24, 0.28, 0.10, and 0.17. Find the probability that in this 30 – minute perioda. More than 2 cars receive gas;b. At most 4 cars receive gasc. 4 or more cars receive gasCathy is planning to take the Certified Public Accountant Examination (CPA exam). Records kept by the college of business from which she graduated indicate that 75% of students who graduated pass the CPA exam. Assume that the exam is changed each time it is given. Let n = 1, 2, 3, ... represent the number of times a person takes the CPA exam until the first pass. (Assume the trials are independent.) (a) What is the probability that Cathy passes the CPA on the first try? (Use 2 decimal places.)(b) What is the probability that Cathy passes the CPA exam on the second or third try? (Use 4 decimal places.)There are two independent file servers in a web site. Either file server works with a probability of 0.8. This web site is up, if either file server is working. Then, the probability that the web site is up is _____. 0.19 0.96 0.70 0.85