the following probabilistic activity time estimates are for the network in problem 9.6. Please do only problem 9.19

9.19. The following probabilistic activity time estimates are for the network in Problem 9.6: Determine the following: a. Expected activity times b. Earliest start and finish times c. Latest start and finish times d. Activity slack e. Critical path f. Expected project duration and standard deviation 9.6. Given the following network with activity times in months, determine the earliest start and finish times, latest start and finish times, and slack for each activity. Indicate the critical path and the project duration: Problem -9.19 (p. 426) - 11 th Ed. (uses network only from problem 9.6; use activity times a, m, and b from problem 9.19). Draw network, tabulate results, and show calculations - as shown in class