A.Bob is going to buy some Compact disc player in a stereo store. 12 of compact displayer in store is Sony brand and 7 is Pioneer brand. If Bob randomly choose 5 disc players in that store, what is the chance that Bob got at most 1 Sony brand player? please choose the nearest answer.

B. Suppose rainfall duration has an exponential distribution with mean equal to 2. What is the chance that the duration of a rainfall is at least one standard deviation above the mean? Find the nearest answer

C. Suppose the number of fish you catch on your weekend fishing trip to the lake follows a Poisson process with an average of one fish every three hours. Suppose you spend a total of 12 hours fishing on the lake during the weekend. What is the probability that you catch 6 fish?