4 A pet shop has 9 rabbits for sale, 6 of which are white. A random sample of two rabbits is chosen without replacement.
- Show that the probability that exactly one of the two rabbits in the sample is white is \(\frac { 1 } { 2 }\).
- Construct the probability distribution table for the number of white rabbits in the sample.
- Find the expected value of the number of white rabbits in the sample.