$\frac{10}{3}$

b$)$ What is the expected completion time of the critical path? What is the expected completion time of the other path in the network?

c$)$ What is the variance of the critical path? What is the variance of the other path in the network?

d$)$ If the time to complete path $A-C$ is normally distributed, what is the probability that this path will be finished in $22$ weeks or less?

e$)$ If the time to complete path $B-D$ is normally distributed, what is the probability that this path will be finished in $22$ weeks or less?

f$)$ Explain why the probability that the critical path will be finished in $22$ weeks or less is not necessarily the probability that the project will be finished in $22$ weeks or less. PX

W$3\mathrm{.}21$ Rich Cole Control Devices, Inc., produces custombuilt relay devices for auto makers. The most recent project undertaken by Cole requires $14$ different activities. Cole's managers would like to determine the total project completion time $($in days$)$ and those activities that lie along the critical path. The appropriate data are shown in the following table.

a$)$ What is the probability of being done in $53$ days?

b$)$ What date results in a $99\%$ probability of completion?

d$)$ What is the provaus or less? $40$ day

$..\mathrm{.}3\mathrm{.}20$ The estimated times and immediate predecessors for the activities in a project at George Kyparis's retinal scanning

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