Given is a PERT project network diagram as shown below.

Screen Shot $2021-06-18$ at $8\mathrm{.}52\mathrm{.}17$ AM$(3).$png

Activity

Start

A

B

C

D

E

F

G

H

End

Time

$0$

$3\mathrm{.}21$

$8\mathrm{.}21$

$2\mathrm{.}31$

$5\mathrm{.}24$

$4\mathrm{.}68$

$7\mathrm{.}45$

$1\mathrm{.}36$

$3\mathrm{.}78$

$0$

a$)$ The Project Completion time $=$ Blank $1($in $2$ decimal places$)$ b$)$ The Earliest Start time, ES$,$ of Activity G $=$ Blank $2($in $2$ decimal places$)$ c$)$ The Latest Finish time, LF$,$ of Acitivity C $=$ Blank $3($in $2$ decimal places$)$ d$)$ The critical activities are $=$ Blank $4($ex$.$ type in critical activities as ABCD, no comma, no space$)$