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9709 P62 - Mar 2019 - Q4
2905

The random variable X takes the values -1, 1, 2, 3 only. The probability that X takes the value x is kx2, where k is a constant.

  1. Draw up the probability distribution table for X, in terms of k, and find the value of k.
  2. Find E(X) and Var(X).
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