A small software development project at Krishna Dhir's firm has five major activities. The fimes are estimated and provided in the table below.

$\backslash$table$[[$IMMEDIATE$],[$ACTIVITY$,$PREDECESSOR,a$,$m$,$b$],[$A$,-,1,4,7],[$B$,-,4,10,16],[$C$,$A$,5,8,17],[$D$,$B$,2,5,8],[$E$,$C$,3,3,3]]$

a$)$ Find the expected completion time for this project.

The expected completion time for this project is $($enter your response as a whole number$).$

b$)$ What variance value would be used to find probabilities of finishing by a certain time?

The project variance value of completion time is $($enter your response as a whole number$).$