Three$-$point estimating is a method of estimating a task or project by considering three different estimates:

The most optimistic estimate

The most pessimistic estimate

The most likely estimate

The weighted three$-$point estimating is derived by applying a weighted average of the optimistic, pessimistic, and most likely estimates.

See Appendix $7\mathrm{.}1$ in your text. Calculate the weighted average $($te$)$ of each activity:

$($O $+4$ML $+$ P$)/6$