P$\mathrm{.}9-3$ Given the following network and probabilistic activity time estimates, determine the expected time and variance for each activity and indicate the critical path: $,$ Use only meantime $(m)$ and conpute CMP

each activity and indicate the critical path

$\backslash$table$[[,$Time Estimates $($weeks$)],[$Activity$,$a$,$m$,$b$],[1,6,10,15],[2,2,7,16],[3,4,8,11],[4,3,10,15],[5,7,9,20],[6,4,12,15],[7,3,6,9],[8,5,9,16],[9,3,20,35],[10,4,12,16],[11,2,9,14]]$