$2)$ A project has tasks listed from A $$ F with the following potential durations shown in Table $1$ below.

a$)$ Using the weighted average technique, calculate the estimated activity duration showing all working and insert your values in Table $1$ and Table $2$ : $(5$ marks$)$

Task Optimistic Completion Time Most Likely Time Pessimistic Completion Time Estimated Task Duration

A $3411$

B $474$

C $018$

D $2316$

E $2310$

F $345$