A recent program review notes that there are three major elements that comprise the entire project to be completed. Each element will take time (stated in days) to complete as dictated by the following respective distributions; element A Normal (300, 45), element B Exponential (125), element C Uniform (120, 360).

a) If the elements are worked sequentially (A -> B -> C), what is the expected time of total project completion? What is the approximate likelihood of project completion in less than the expectation just stated?

b) If the elements are worked in parallel (A||B||C), what is the approximate likelihood the entire project is completed in less than 300 days?