please help.

Time estimates weeks Immediate Predecessor 8 Most likel Draw the activity-on-node (AON) project network associated with the following activities. Calculate the expected time and variance for each activity. Calculate the activity slacks and determine the critical path, using the expected activity times. What is the probability of completing the project within 22 weeks? What is the probability of completing the project within 19 weeks? What project deadline would allow a 90% probability of ontirne completion