9709 P61 - Nov 2013 - Q2
2624
The people living in two towns, Mumbok and Bagville, are classified by age. The numbers in thousands living in each town are shown in the table below.
| Mumbok | Bagville | |
|---|---|---|
| Under 18 years | 15 | 35 |
| 18 to 60 years | 55 | 95 |
| Over 60 years | 20 | 30 |
One of the towns is chosen. The probability of choosing Mumbok is 0.6 and the probability of choosing Bagville is 0.4. Then a person is chosen at random from that town. Given that the person chosen is between 18 and 60 years old, find the probability that the town chosen was Mumbok.
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