Dont copy through chegg its incorrect i post 2nd time provide correct ans

Problem 17-7 Three recent college graduates have formed a partnership and have opened an advertising firm. Their first project consists of activities listed in the following table. Use Table B. Activity A B LOUWLOI-8 TIME IN DAYS Immediate Predecessor Optimistic Most Likely Pessimistic 5 6 7 8 8 11 8 11 9 12 15 5 6 9 D 5 6 7 F 2 3 7 B 4 4 5 H 5 7 8 E, G1 F CUOLLI End b. What is the probability that the project can be completed in 24 days or less? In 21 days or less? (Round your te and z values to 2 decimal places and "Standard devlatlon" to 3 decimal places. Round your final answers to 4 decimal places.) Probability Days 24 days or less 21 days or less C. Suppose it is now the end of the seventh day and that activities A and B have been completed while activity D is 50 percent completed. Time estimates for the completion of activity D are 5, 6, and 7. Activities C and H are ready to begin. Determine the probability of finishing the project by day 24 and the probability of finishing by day 21. (Round your Intermediate calculations to 3 decimal places and final answers to 4 decimal places.) Probability Day 24 Day 21