The distance traveled by a postman in Cd. Jurez presents a Normal distribution with a mean of 45 km and a standard deviation of 10 km.

Find the probability that:

• P(X = 39) = X is less than 49 km.
• At least what distance is traveled by the postman if the value Z = 0?
• The distance traveled is between 32 or 40 km.
• The distance traveled is less than 30.73 or greater than 49 km.