Determine the following table( three activity time estimators)

NOTE: assume preceding yourself

Activity	Designation	Time estimators (weeks) a m b
1.Design	A	10	22	28
2.Build prototype	B	1	4	7
3.Evaluate equipment	C	4	6	14
4.Test prototype	D	1	2	3
5.Write report	E	1	5	9
6.Write method report	F	7	8	9
7.Write final report	G	2	2	2

Calculate the following

.Expected time (ET)

.Activity variance ²

.Critical path

.Identify all paths in network and their estimated completion times and variances

.Determine the probability of completing the project in desired weeks(39 weeks) ....using normal probability distribution