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9709 P63 - Jun 2012 - Q4
2940

The six faces of a fair die are numbered 1, 1, 1, 2, 3, 3. The score for a throw of the die, denoted by the random variable W, is the number on the top face after the die has landed.

  1. Find the mean and standard deviation of W. [3]
  2. The die is thrown twice and the random variable X is the sum of the two scores. Draw up a probability distribution table for X. [4]
  3. The die is thrown n times. The random variable Y is the number of times that the score is 3. Given that E(Y) = 8, find Var(Y). [3]
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