The software solution dinision at Mastel. Inc has been working on an application which on development would have a large market. In order to remain market leaders and innovators of new products, they have to complete this project as soon as possible. The division manager resorts to the use of PERT in the scheduling of the project activities. The following table depicts the information on the activitice$($a$)$ Find the critical path and the expected project completion time through a PERT network diagram.$($b$)$ What is the probability that the project will be compicted within $30$ day$*?$