Activity

Optimistic Time $($a$)$

Most Likely

Time $($m$)$

Pessimistic

Time $($b$)$

Expected Duration

A $-$ Review Design

$18$

$24$

$30$

$24$

B $-$ Assemble Item

$14$

$21$

$28$

$21$

C $-$ Inspect Item

$4$

$6$

$8$

$6$

D $-$ Package Item

$5$

$10$

$12$

$?$

Figure $7-5$ Duration Estimates

Consider the activity duration estimates presented in Figure $7-5.$ Based on the information provided and adopting the PERT conventions to calculate expected activity durations, what is the expected duration of Activity D $-$Package Item$?$

$$

a$.9$ days

b$.9\mathrm{.}5$ days

c$.12$ days

d$.10$ days