| Fixture | Male | Female |
| Water closet | 1 number per 100 up to 400 and over 400, 1 number for every 250 or part thereof | 3 numbers per 100 up to 200 population and over 200, 2 numbers for every 100 or part thereof |
P and Q play chess frequently against each other. Of these matches, P has won 80% of the matches, drawn 15% of the matches, and lost 5% of the matches.
If they play 3 more matches, what is the probability of P winning exactly 2 of these 3 matches?
In a regular semi-circular arch of 2 m clear span, the thickness of the arch is 30 cm and the breadth of the wall is 40 cm. The total quantity of brickwork in the arch is _______ m\(^3\). (rounded off to two decimal places)
