Question: An activity on a PERT network has these time estimates: optimistic =3, most likely =5, and pessimistic =12. What are its expected activity time and

An activity on a PERT network has these time estimates: optimistic

An activity on a PERT network has these time estimates: optimistic =3, most likely =5, and pessimistic =12. What are its expected activity time and variance? \begin{tabular}{l} none of these \\ 5.50;1.36 \\ \hline 5.00;9.00 \\ 5.83;2.25 \\ 6.67;2.25 \end{tabular}

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