A partially solved PERT problem is detailed in the table below. Times are given in weeks.

Activity

Preceding

Optimistic

Time

Probable

Time

Pessimistic

Time

Expected

Time

Variance

A

--

7

9

14

B

A

2

2

8

C

A

8

12

16

D

--

3

5

10

E

C

4

6

8

F

B

6

8

10

G

F

2

3

4

H

D, E

2

2

8

I

G

6

8

16

J

H

4

6

14

K

I, J

2

2

5

a)Calculate the expected time for each activity.

b)Which activities form the critical path?

c)What is the project variance?

d)What is the project standard deviation?

e)What is the probability of completion of the projectAFTERweek 40?

explain please