6.Select the incorrect statement.

7.In the network shown in Fig., the concurrent and preceding activities corresponding to activity 2-4 are respectively

8.If an activity has its optimistic, most likely and pessimistic times as 2, 3 and 7 respectively, then its expected time and variance are respectively

9.In the network shown in Fig. independent float for the activity 3-5 will be (the number on the arrow shows the duration of activity)

10.In PERT analysis, the time estimates of activities and probability of their occurrence follow