$2-$For the following project, draw the network and

a$)$ calculate expected time for each activity: calculate the expected time for activity $8.$

$\backslash$table$[[$Node Nos.,Predecessor$($s$),\backslash$table$[[$Shortest likely$],[$Time$]],\backslash$table$[[$Most likely Time$],[$Longest Likely$],[$Time$]],],[1,-,1,2,3],[2,1,5,6,7],[3,1,3,4,5],[4,1,1,2,3],[5,2,2,4,6],[6,2,3,4,4,5,6],[7,2,1,3,5],[8,5,6,1,2,3]]$

Answer: $2\mathrm{.}33$