9. A case of wine has 10 bottles, 2 of which contain spoiled wine. A sample of 3 bottles is randomly selected from the case. (a) [4] What is probability that the sample contains 2 bottles of spoiled wine? (b) [4] What is probability that all 3 of the sampled bottles are spoiled? (c) [4] What are the mean and variance of the number of spoiled bottles in the sample?