Ross Hopkins, president of Hopkins Hospitality, has developed the tasks, durations, and predecessor relationships in the following table for building new motels.

$\backslash$table$[[,$Time $($weeks$),$Immediate,,Time $($weeks$),$Immediate$],[$Activity$,a,m,b,$Predecessor$($s$),$Activity,$a,m,b,$Predecessor$($s$)],[$A$,4,9,10,-,$G$,3,3,5,$C$,$ E$],[$B$,1,8,24,$A$,$H$,2,2,2,$F$],[$C$,9,12,18,$A$,1,7,7,7,$F$],[$D$,4,7,9,$A$,$J$,6,7,14,$D$,$ G$,$ H$],[$E$,1,3,4,$B$,$K$,3,3,4,$I, J$],[$F$,5,8,20,$C$,$ E$,,,,,]]$

a$)$ The expected $($estimated$)$ time for activity $C$ is $,$ weeks. $($Round your response to two decimal places.$)$

b$)$ The variance for activity $C$ is $2\mathrm{.}25$ weeks. $($Round your response to two decimal places.$)$

c$)$ Based on the calculation of the estimated times, the critical path is