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development group. The group's leader turned to PERT$/$CPM as an aid to scheduling the activities remaining before the new product can be brought to the market.

The project network is depicted in the following diagram,

The activity time estimates $($in weeks$)$ are listed in the following table.

$($a$)$ Develop an activity schedule for this project and identify the critical path activities. $($Enter your answers as a comma$-$separated list.$)$