Suppose that at a gas station the daily demand for regular petrol is normally distributed with a mean of 200,000 liters and a standard deviation of 15,000 liters. The station manager has just opened the station for business and notes that there is exactly 160,000 liters of regular petrol in the storage. The next delivery is scheduled later today at the close of business. What is the probability that he will have enough regular petrol to satisfy today's demand?