Z (+)	0.96	0.97	0.98	0.99	1.00
Probability (Pr) (%)	83.15	83.40	83.65	83.89	84.13

Activity	to	tm	tp
1-2	6	9	12
1-3	3	4	11
2-4	2	5	14
3-4	4	6	8
3-5	1	1.5	5
2-6	5	6	7
4-6	7	8	15
5-6	1	2	3

Determine for given activities :

1. Critical path using PERT.

2. Calculate variance and standard deviation for each activity.

3. Calculate the probability of completing the project in 26 days.