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___________________?

– by
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___________________?

A. 3.5 and 5/6
B. 5 and 25/36
C. 3.5 and 25/36
D. 4 and 5/6