You and your father have taken on the project of remodeling your basement to turn it into a “mother-in-law” apartment for your relatives. You have calculated that you expect to complete the project in 68 days. Because your deliveries from suppliers are uncertain, you have had to assume a project variance of 21 days.

1. What is the probability the project will be completed in 50 days?

2. What is the probability the project will be completed in 70 days?

3. What is the probability the project will be completed in 90 days?

4. What is the due date that yields a 99% probability of completion?