Question: QUESTION 18 Data for Problems 18-20. The following is a PERT model. The three estimates of the activity times are given in the table below.

QUESTION 18 Data for Problems 18-20. The following is a PERT model. The three estimates of the activity times are given in the table below. Most but not all of the le and o? have been computed for you. You need to compute the rest. tp 2 Activity to 11-2 12 1-3 2 2-4 11 2-5 3-4 11 3-6 1 14-6 1 5-6 1 tm 14 14 3 16 2 2 19 3 16 16 5 19 3 3 11 te 14 14 3 16 2 2 2 3 0.4444 0.4444 0.4444 1.0000 10.1111 10.1111 ? 0.4444 What is the average completion time of the entire project? tm 4 14 lp 16 16 5 Activity to 11-2 12 11-3 12-4 11 12-5 3 3-4 1 13-6 1 146 15-6 1 te 14 14 3 16 2 2 0.4444 10.4444 0.4444 1.0000 10.1111 10.1111 ? 0.4444 3 3 11 15 What is the average completion time of the entire project? 15 days 16 days 17 days O 18 days QUESTION 19 What is standard deviation of the project completion time"? O 1.972 1.915 O 2.055 1.826 QUESTION 20 What is the probability that the project will be completed within 20 days? 0.8340 0.9357 O 0.9817 0.9955

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