Question

Activity 7-8 is directly preceded by two activitiesactivity 5-7 and activity 6-7. Activity 5-7 has an expected time of five and an ES time of six. Activity 6-7 has an expected time of seven and an ES time of seven. Activity 7-8 has an expected time of 10. The ES for activity 7-8 is:

A. 11.

B. 14.

C. 21.

D. 24.

E. 25.

Answer

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