Which of the following statements regarding PERT analysis is true?
1- Each activity has two estimates of its duration.
2- Project variance is the sum of all activity variances.
3- Project standard deviation is the sum of all critical activity standard deviations.
4- Only critical activities contribute to the project variance.
5- none of these is true.

#1 - The Beta distribution is used in project management to
a) calculate slack on activities not on the critical path
b) calculate the probability that a project will be completed within its budget
c) calculate pessimistic and optimistic activity times
d) determine which activity should be crashed
e) none of these

#2 - The Beta distribution is used in project management to
a) determine which activity should be crashed
b) calculate the probability that a project will be completed within its budget
c) calculate expected activity times
d) calculate slack for activities on the critical path
e) none of these

What do you think ?
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#1. I believe it is C. Since it is calculating which each one of these.
#2. I believe it is C also. Since calclulating the pessimistic and optimistic activity times will give you the activity time within the equation you are trying to solve.

But for some reason I am second guessing myself. These questions are on a practice test. But we are aloud to use any information we can on our final (which is 4 hours long). So I want to make sure I have everything correct in case one of these questions were to actually come up. Thanks for the help.