calculate A-E please

Jordanne King, the project manager for Webjets International, Inc., compiled a table showing time estimates for each of the activities of a project to upgrade the company's Web page, including optimistic, most likely, and pessimistic. Most likely (days) Activity B C D E Optimistic (days) 3 12 1 3 1 15 5 10 3 Pessimistic (days) 19 19 15 21 7 a. Calculate the expected time, 1. for each activity. (Enter your responses rounded to two decimal places.) Activity A Expected Time (days) 8.3 B 15.16 6 D 10.67 E 3.3 b. Calculate the variance, o?. for each activity. (Enter your responses rounded to two decimal places.) Variance Activity A