Use PERT Technique to calculate

$1)$ Given the immediate predecessors and a$,$ m$,$ b for each activity in the tables below, compute:

a$)$ te and V for each activity

b$)$ Te and Vp for the project.

c$)$ What is P $($Te $<23)?$

d$)$ What is P $($Te $<32)?$

e$)$ For what Ts is the probability $95$ percent that the project will be completed?

f$)$ For what Ts is the probability $85$ percent that the project will be completed?

Activity Predecessors a m b

A $7911$

B A $123$

C A $789$

D B $2511$

E C $234$

F C $148$

G D$,$ E $678$

H F$,$ E $269$