Case $1($questions $4-5)($SHOW WORK$)$

A small software development project has the following major activities. The estimates times are provided below:

$\backslash$table$[[$Activity$,$Immediate Predecessor,a$,$m$,$b$],[$A$,--,2,5,8],[$B$,$A$,3,6,9],[$C$,$A$,4,7,10],[$D$,$B$,2,5,14],[$E$,$D$,3,3,3],[$F$,$C$,6,8,10],[$G$,$E$,$ F$,1,1,1],[$H$,$C$,6,10,14],[$I$,$G$,$ H$,3,4,5]]$

What is the expected completion time for this project?

Answer:

$5.$ What variance would be used in finding probabilities of finishing the project by a certain time?

Answer: