In preparing to launch a new product, a marketing manager has determined the critical path for her department. The activities and the mean and variance of the completion time for each activity along the critical path are shown in the accompanying table. Determine the mean and variance of the completion time of the project.

Expected Completion Activity Time (Days) Variance Develop survey questionnaire 8 2 Pretest the questionnaire 14 5 Revise the questionnaire 5 1 Hire survey company 3 1 Conduct survey 30 8 Analyze data 30 10 Prepare report 10 3