The following represents a project that should be scheduled using CPM:

ACTIVITY IMMEDIATE PREDECESSORS TIMES $($DAYS$)$

a m b

A $159$

B $123$

C A $357$

D A $1410$

E B $123$

F C$,$D $1212$

G D$,$E $168$

H F$,$G $238$

What is the critical path?

multiple choice

B$-$E$-$G$-$H

A$-$D$-$G$-$H correct

A$-$C$-$F$-$H

A$-$D$-$F$-$H

What is the expected project completion time?

Note: Do not round intermediate calculations. Round your answer to $3$ decimal places. $18\mathrm{.}667$ correct

c$)$ What is the probability of completing this project within $20$ days?

Note: Use Excel's NORM.S$.$DIST function to find the correct probability for your computed Z value. Do not round intermediate calculations. Round Z value to $2$ decimal places and final answer to $4$ decimal places. The only one I am confused on is part C$)$