The following represents a project that should be scheduled using CPM:

ACTIVITY IMMEDIATE PREDECESSORS TIMES $($DAYS$)$

a m b

A $126$

B $123$

C A $2511$

D A $1212$

E B $123$

F C$,$D $135$

G D$,$E $1311$

H F$,$G $2311$

Calculate the ET and sigma square