8. Compute the mean and variance for each of the following activities: Activity Optimistic Pessimistic Most Likely A 5 10 7 B 3 21 15 C 18 32 25 D 9 11 10 E8 8 8 F 1 10 6 G 45 95 60 H 12 15 13 I 7 11 9 J 22 80 60