The estimated times and immediate predecessors for the activities for Ricky Bobby's pit crew

are given in the following table. Assume that the activity times are independent. To solve this

problem, calculate the expected completion time and variance for each activity, draw a

network diagram, complete a forward and backward pass, and identify the critical path. Follow

the step$-$by$-$step solution approach in Gido and Clements text, Chapter $5,$ Appendix $1$ called

Probabilistic Activity durations. What is the probability that this path will be finished in $22$

weeks or less? Your answer should be carried out to two decimal places.