Standard deviation and variance of activities in a project are given in table below. What is the probability (z) that the project will be completed within 20 weeks? The project duration has been calculated as 17.5 weeks. Activities B, C, E, and G are critical.

30 similar houses are to be built in a housing project. For each house, 10 trade activities need to be carried out, and their relationships are given in the following network diagram. The duration of each trade activity for one house is listed in the table. 

Assume all the trade activities need to be carried out continuously and the total project needs to be finished in the shortest possible time.

(1) Calculate the total duration, starting week and finishing week for each trade using the LOB method.

(2) Determine the total project duration.

What is finish time of the project?

What is expected completion time of the project?

The following precedence diagram shows all the activities involved in the construction of one floor of a high-rise building. The duration of each activity is also given (in days).  There are 18 typical floors to be constructed for this high-rise building.

When Activity C Can Complete?

What is standard deviation of project completion time?

See below for a project's precedence diagram and each activity's duration given in the table. 

(1) If the project manager for the following project wants to be at least 80% sure about the scheduled completion time, how many weeks the project should be scheduled?

(2) What is the possibility that the project will complete in less than 32 weeks?

For the given overlapping network diagram:

(1) Describe the relationship between all activities. (For example, AC is Finish to Finish).

(2) Calculate the Early Start Date and Early Finish Date of each activity.

(3) Determine the project duration.

What is critical path of the project?