The daily demand for coke cans in a cafeteria is approximately normally distributed with mean 150 and standard deviation 20. Let X be a RV that represents the demand.
1. P(X ≤ 200) = ?
2. P(X ≥ 180) = ?
3. P(150 ≤ X ≤ 180) = ?
4. How many cans should be stocked so that P(running out of cans) = 0.1?