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27. In the following table, task durations are given in weeks. The estimates were made at the 95 percent level (see Section 5.2, Calculating Probabilistic Activity Times subsection). a. Find the expected time and variance for each task. b. Draw the network (either AOA or AON ) and find the critical path and time. c. Find the probability that the critical path will be completed in 23 weeks. d. Find the probability that the other main paths will be completed in 23 weeks. e. What is the probability that the entire network will be completed in 23 weeks? Exercise problems Questions 25, 26, 27 \& 28 - Just refer to the tables - Draw an AON diagram - Find ES, EF, LS, LF - Find critical Paths and activities 27. In the following table, task durations are given in weeks. The estimates were made at the 95 percent level (see Section 5.2, Calculating Probabilistic Activity Times subsection). a. Find the expected time and variance for each task. b. Draw the network (either AOA or AON ) and find the critical path and time. c. Find the probability that the critical path will be completed in 23 weeks. d. Find the probability that the other main paths will be completed in 23 weeks. e. What is the probability that the entire network will be completed in 23 weeks? Exercise problems Questions 25, 26, 27 \& 28 - Just refer to the tables - Draw an AON diagram - Find ES, EF, LS, LF - Find critical Paths and activities