I thought I had posted to the wrong forum heading. So reposting

I have a couple of qs

1. A project manager has been asked by the client to meet the promise date of the project. The project manager analyzes the schedule before promising a date to the customer. The project manager uses the program evaluation and review technique to evaluate the project schedule. She decides that based on the PERT calculations she can promise a delivery date of June 30. The expected value of the project completion date is May 30. If the project manager is willing to accept a 5% probability that the project will be delivered later than June 30, what is the standard deviation of the duration of the activities on the critical path? Assume a five-day workweek.

a. Ten days
b. Fifteen days
c. One-half month
d. One month

Ans - c

2. Which of the following is true?
a. The critical path is the path through the network that has the highest total duration
b. The critical path is the path with the least amount of free float
c. The critical path is the list of activities that have zero float
d. The critical path is the list of activities that have critical risks associated with them

Ans - c

Please share your opinions, reasoning and approaches. Thx.