Use PERT to solve the following problem and answer questions. Choose the closest answer. $(2\mathrm{.}5$ points for each question. total $25$ point$)$ E ST FIN B$.$ D F SI A B Most Likely Duratios Dm $03015$ Optimistic Duration Do $0181024106120$ Pessimistic Duration Dp $07220905054500$ COM E F FIN $3015250$ Useful Formulas Mean Duration $($Do $+4*$Dm $+$Dp$16$ Standard Deviation $($Dp $-$ Doy$6$ Variance Standard Deviation Do Optimistic Duration Dm Most Likely Duration Dp $-$ Pessimistic Duration