$6.$ What is a $$dummy$$ activity?

$7.$ Consider Figure $5-14.$ Paths a$-$b$-$c and a$-$b$-$d converge at activity f$,$ but we ignored this

potential merge problem in the text. Why?

$8.$ What is meant by $$project slack$?$

$9.$ When using AON networks, how does one indicate an event such as a project milestone?

$10.$ A probabilistic network has a critical path of $21$ days and a $0\mathrm{.}95$ probability of completing

this path in $24$ days. Therefore, the project has $0\mathrm{.}95$ chance of being finished by the end of

the $24$th day. True or False? Briefly explain your answer.