Old MathJax webview

I need a professional to answer this question.

thanks

This question was sent earlier. It was returned for more clarification..

In nutshell, I don't know what to say about more clarification. I want to know the solution to the above question.

thanks

Kelle Carpet and Trim installs carpet in commercial offices Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table: Immediate Predecessor(s) Activity A B D E F Time (days) a m b 4 6 8 10 11 12 1 2 3 7 8 9 3 5 7 6 10 15 Activity G H 1 J K Time (days) a m 1 2 4 6 10 11 13 15 8 b 3 8 12 17 12 Immediate Predecessor(s) . F G BD A, E 4 HI This exercise contains only parts b, c, and d. Kelle Carpet and Trim installs carpet in commercial offices. Peter Kelle has been very concerned with the amount of time it took to complete several recent jobs. Some of his workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time (all in days) for a new contract are given in the following table: a 1 Activity A B D E F Time (days) a m b 4 6 8 10 11 12 1 2 3 7 8 9 3 5 7 6 10 15 Immediate Predecessor(s) Activity G H 1 J BD K A E 4 10 13 4 Time (days) m 2 6 11 15 8 b 3 8 12 17 12 Immediate Predecessor(s) AE F G H This exercise contains only parts b, c, and d