The estimated times and immediate predecessors for the activities in a project at Howard Umrah's retinal scanning company are given in the following table. Assume that the activity times are independent. Time (weeks) Immediate Time (weeks) Immediate Activity 7 Predecessor(s) Activity b. Predecessor(s) 12 a a m 10 12 10 A 12 16 D. 8. 14 B 5 AB d) If the time to complete the activities on the critical path is normally distributed, then the probability that the critical path will be finished in 21 weeks or less = (enter as a probability and round your response to two decimal places).