Activity Z Has Estimates a = 5,b = 12,m =

Multiple Choice

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?

A) Activity X is longer than Activity Y.
B) Activity X has a higher standard deviation than Activity Z.
C) Activity Z is shorter than Activity Y.
D) Activity Y has a smaller variance than Activity Z.