Q4 (Reliability Design) Suppose a small community's water demand in the future 10 years is estimated to be a random variable following a normal distribution with a mean of 200 million litres per year (MLPY) and a standard deviation of 30 MLPY. On the other hand, the supply system has a random capacity due to many factors such as equipment breakdowns, water main breaks, and so on. The supply capacity is also estimated to be a normal random variable with a coefficient of variation of 0.10. In order to ensure 99% reliability of supply, what is the mean capacity the system should be designed to?