Paul Smith (operation manager) at the carpet company has been very concerned with the amount of time it took to complete several recent jobs. Some of her workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and their pessimistic completion time (all in days) for a new contract are given in the following table

Activity times and precedent relations are given below for a project.

Activity            a      m      b     Immediate Predecessor(s)

A                     4       6      8            -

B                     3       4      5            -

C                     2       3      4            -

D                     5       6      7            C

E                      2       4      6          B, D

F                      4       7    10         A, E

G                     2       3     4          A, E

H                     3       6     9             F

I                      10    11   12           G

J                      6       9    12           C

K                     6       8    10         H, I

Manually: Draw the network diagram and show ES,EF,LS,LF and slack time of each activity in the diagram.