Time estimates

Expected Variance

Activity Optimistic Most Likely Pessimistic Time $($ET$)$

$($s$)$

A

$29$

$40$

$53$

B

$44$

$49$

$58$

C

$44$

$60$

$72$

D

$22$

$31$

$34$

What is the estimated expected $($mean$)$ time for activity B$?$

$60$ days