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Unformatted text preview: the tenth draw? 4. (2 points) A box contains 18 tennis balls, of which 8 are new. Suppose that three balls are selected randomly, played with, and after play they are returned to the box. If another three balls are selected for play a second time, what is the probability that they are all new? 5 . (2 points) Mustang Sally has two stables on her ranch, one that houses 20 horses and 13 mules, the other with 25 horses and 8 mules. Without any pattern, animals occasionally leave their stables and then return to their stables. Suppose that during a period when all the animals are in their stables, a horse comes out of a stable and then returns. What is the probability that the next animal coming out of the same stable will also be a horse? ....
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This note was uploaded on 02/26/2012 for the course STATISTICS 420 taught by Professor Wierman during the Fall '11 term at Johns Hopkins.
- Fall '11