I solved all the problems above but I'm not understanding this whole table thing.

Ross Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels. Immediate Predecessor(s) Time (weeks) m b a Activity B 2 4. 3 1 Time (weeks) a m b 4 9 12 2 8 24 8 12 16 4 7 10 1 3 4 6 9 20 Activity G H 1 J 1 5 6 1 5 A A A B CE Immediate Predecessor(s) CE F F D. GH I, J 5 7 C D E F 14 1 1 4 a) The expected (estimated) time for activity C is 12 weeks. (Round your response to two decimal places.) b) The variance for activity C is 1.78 weeks. (Round your response to two decimal places.) c) Based on the calculation of the estimated times, the critical path is A-B-E-F-H-J-K d) The estimated time for the critical path is 42 weeks. (Round your response to two decimal places.) e) The activity variance along the critical path is 22.94 weeks. (Round your response to two decimal places.) f) Using the standard normal table, the probability that Hopkins Hospitality will finish the project in 40 weeks or less is 0.5675. (Enter as a probability and round your response to three decimal places.) The table below shows the total area under the normal curve for a point that is Z standard deviations to the right of the mean. Z 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.50000.5040 0.50800.5120 0.51600.5199 0.5239 0.5279 0.5319 0.5359 0.5398 0.5438 0.5478 0.5517 0.55570.5596 0.5636 0.5675 0.5714 0.5754 0.5793 0.5832 0.58710.5910 0.5948 0.5987 0.6026 0.6064 0.6103 0.6141 0.6179 0.62170.6255 0.6293 0.63310.6368 0.6406 0.6443 0.6480 0.6517 0.6554 0.6591 0.6628 0.6664 0.6700 0.6736 0.6772 0.6808 0.6844 0.6879 0.6915 0.6950 0.6985 0.7019 0.7054 0.7088 0.7123 0.7157 0.7190 0.7224 0.7258 0.7291 0.7324 0.7357 0.7389 0.7422 0.7454 0.7486 0.75180.7549 0.75800.7612 0.76420.7673 0.77040.7734 0.7764 0.7794 0.7823 0.7852 0.7881 0.79100.7939 0.7967 0.7996 0.8023 0.8051 0.8079 0.8106 0.8133 0.81590.8186 0.8212 0.8238 0.8264 0.8289 0.8315 0.8340 0.8365 0.8389 0.8413 0.8438 0.8461 0.8485 0.8508 0.8531 0.8554 0.85770.8599 0.8621 0.86430.8665 0.8686 0.8708 0.8729 0.8749 0.8770 0.8790 0.8810 0.8830 0.8849 0.8869 0.8888 0.8907 0.8925 0.8944 0.89620.8980 0.8997 0.9015 0.9032 0.9049 0.9066 0.9082 0.9099 0.91150.91310.91470.9162 0.9177 0.91920.9207 0.9222 0.9236 0.9251 0.9265 0.9279 0.92920.9306 0.9319 0.93320.9345 0.93570.9370 0.93820.9394 0.9406 0.9418 0.9430 0.9441 0.9452 0.9463 0.9474 0.9485 0.9495 0.9505 0.9515 0.9525 0.9535 0.9545 0.9554 0.9564 0.9573 0.9582 0.9591 0.9599 0.9608 0.9616 0.9625 0.9633 0.9641 0.9649 0.9656 0.9664 0.96710.9678 0.9686 0.9693 0.9700 0.9706 0.97130.9719 0.9726 0.9732 0.9738 0.9744 0.9750 0.9756 0.9762 0.9767 0.97730.9778 0.97830.9788 0.9793 0.9798 0.9803 0.9808 0.9812 0.9817 n 0821 10 9826 10 9820 1981 19828 18 0812 17 9816 1n 9850 Ina851 17 0857 | 21