Question: Activity Z has estimates a = 5 , b = 1 2 , m = 7 ; activity X has estimates a = 5 ,

Activity Z has estimates a=5, b=12, m=7; activity X has estimates a=5, b=11, m=6; and activity Y has estimates a=3, b=11, m=8. Which of the following statements is BEST? Here a refers to the optimistic time, b the pessimistic time and m the most likely time.
Group of answer choices
Activity Z is shorter than Activity Y.
Activity Y has a smaller variance than Activity Z.
Activity X has a higher standard deviation than Activity Z.
Activity X is longer than Activity Y.

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