9709 P63 - Jun 2010 - Q5
2947
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.
- Show that \(P(X = 2) = \frac{3}{7}\).
- Tabulate the probability distribution of X.
- Find \(E(X)\) and \(\text{Var}(X)\).
- Given that \(X = 2\), find the probability that the digit chosen from set A was 2.
