Exam-Style Problem

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June 2010 p63 q5
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Set A consists of the ten digits 0, 0, 0, 0, 0, 0, 2, 2, 2, 4.

Set B consists of the seven digits 0, 0, 0, 0, 2, 2, 2.

One digit is chosen at random from each set. The random variable X is defined as the sum of these two digits.

  1. Show that \(P(X = 2) = \frac{3}{7}\).
  2. Tabulate the probability distribution of X.
  3. Find \(E(X)\) and \(\text{Var}(X)\).
  4. Given that \(X = 2\), find the probability that the digit chosen from set A was 2.
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