3 A bag contains 5 yellow and 4 green marbles. Three marbles are selected at random from the bag, without replacement.
- Show that the probability that exactly one of the marbles is yellow is \(\frac { 5 } { 14 }\).
The random variable \(X\) is the number of yellow marbles selected. - Draw up the probability distribution table for \(X\).
- Find \(\mathrm { E } ( X )\).