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. What is the earliest completion time of D?

Select one:

a. 14

b. 10

c. 16

d. 11

Suppose an activity has an optimistic processing time of 4 days, a most likely time of 10 days, and a pessimistic processing time of 16 days.Determine the variance associated with this activity.

Select one:

a. 1 day

b. 2 days

c. 3 days

d. 4 days

A cashier at a department store can ring up 25 customers in every hour. About 15 customers enter the store every hour. How many minutes will the customer spend from the time he/she arrives to the time he/she departs after buying something?

Select one:

a. 10

b. 6

c. 3

d. 9

e. None of the above