b$.$ What is the critical path?

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

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

$A-D-F-H$

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

c$.$ What is the expected project completion time?

Note: Do not round intermediate calculations. Round your answer to $3$ decimal places.

Project completion time $20\mathrm{.}160$ days

Project completion time $20\mathrm{.}160$ days

d$.$ 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.