Pert estimate question
Here is the question i am confused how to calculate with the information gave:
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
This i found on the PM question bank, with no explanation.
Thank you all for the helpful info.