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Part $1$

Task time estimates for the modification of an assembly line at Jim$$ Goodale's Carbondale,$$ Illinois, factory are as$$ follows:

Activity

Time

$($in hours$)$

Immediate$$ Predecessor$($s$)$

A

$7\mathrm{.}0$

long dash

B

$7\mathrm{.}2$

long dash

C

$5\mathrm{.}0$

A

D

$7\mathrm{.}0$

$$B$,$ C

E

$5\mathrm{.}1$

$$B$,$ C

F

$7\mathrm{.}7$

D

G

$5\mathrm{.}0$

$$E$,$ F

This exercise contains only part a$.$

Part $2$