The standard deviation of the critical path of the project is

Question

Statement for Linked Answer Q01 & 02

Consider a PERT network for a project involving six tasks (a to f)

Task	Predecessor	Expected task time (in days)	Variance of the task time (in days2)
a	-	30	25
b	a	40	64
c	a	60	81
d	b	25	9
e	b, c	45	36
f	d, e	20	9

 

1. The expected completion time of the projects is                                                                                                                        

      (a) 238 days                    (b) 224 days                (c) 171 days                    (d) 115 days

 

    2. The standard deviation of the critical path of the project is                                                                                                        

      (a) $\sqrt{151}$  days                  (b) $\sqrt{155}$days               (c) $\sqrt{200}$  days                  (d) $\sqrt{238}$ days