A Project Consists of Nine Major Activities, as Shown Below

A project consists of nine major activities, as shown below. There are three separate paths in the network: a-c-f, b-d-g, and e-h-i.
(A) What is expected project duration time?
(B) Determine the probability that the project will take more than 35 weeks to complete. (All times are in weeks.)
$$\begin{array} { l l l } \text { Activity } & \text { Exp. Duration } & \text { Std.Dev. } \\\hline \text { a } & 7 & 1 \\\text { b } & 10 & 1 \\\text { c } & 9 & 2 \\\text { d } & 11 & 2 \\\text { e } & 16 & 2 \\\text { f } & 14 & 2 \\\text { g } & 10 & 2 \\\text { h } & 8 & 1 \\\text { I } & 8 & 2\end{array}$$