Most Optimistic Time , Most Probable Time ,Most Pessimistic Time from the PDM diagram?.

ta= Most optimistic time tm= Most probable time tb= Most pessimistic time Mean()=6ta+4tm+tb (Expected duration) Variance (2)=(6tbta)2 Standard Deviation ()=2 ta= Most optimistic time tm= Most probable time tb= Most pessimistic time Mean()=6ta+4tm+tb (Expected duration) Variance (2)=(6tbta)2 Standard Deviation ()=2