Job A, B, C, D, E with processing times (days): 8, 2, 4, 6, 7 respectively and immediate predecessors are: A has none, B needs A, C needs B, D needs B, E needs both C and D. Which activity along the critical path has a slack time of 2 days? Select one: a. A b. B c. C d. D e. None of the above.

An algebraic optimization problem must involve three variables. These include:

Select one:

a. Decision, objective, constraints

b. Constraints, probability, decision

c. Random, parameters, control

d. Decision, Random, constraints

e. Objective, Decision, parameters

A cashier at a department store can ring up 25 customers in every hour. About 15 customers enter the store every hour. What is the average waiting time for a customer before paying?

Select one:

a. 2 min.

b. 10 min.

c. 16 min.

d. 20 min.

e. None of the above