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The activity-on-arrow network models community event preparation. Nodes are events. Solid arrows are activities and dashed arrows are zero-duration dummy activities. Each edge label gives the activity id and duration in days

Activity-on-arrow network. Nodes are events. Event order: [15 | 17 | 18 | 16 | 20 | 21 | 22 | 19]. Full activity list: E: 15 to 17, 2 days, solid; F: 17 to 16, 13 days, solid; G: 15 to 18, 2 days, solid; H: 18 to 16, 9 days, solid; I: 16 to 20, 3 days, solid; J: 20 to 19, 3 days, solid; K: 16 to 21, 2 days, solid; L: 21 to 19, 9 days, solid; M: 16 to 22, 3 days, solid; N: 22 to 19, 2 days, solid.E (2 days)F (13 days)G (2 days)H (9 days)I (3 days)J (3 days)K (2 days)L (9 days)M (3 days)N (2 days)1517181620212219
Complete activity data
ActivityFrom eventTo eventDuration (days)Arrow
E15172activity (solid)
F171613activity (solid)
G15182activity (solid)
H18169activity (solid)
I16203activity (solid)
J20193activity (solid)
K16212activity (solid)
L21199activity (solid)
M16223activity (solid)
N22192activity (solid)
(a)1 mark

What is the EST of activity K?

(b)1 mark

How much total float does activity K have?