Question 1

The variance of an activity is given by:

Accepted Answer

The answer of The variance of an activity is given...

Question 2

An activity has a pessimistic time that is three times as long as its most likely time and five times as long as its optimistic time.If the activity variance is 10,what is the expected time?

Accepted Answer

The answer of An activity has a pessimistic time that...

Question 3

Ray's shipment of materials hit every red light and traffic jam on the way to the site.Upon arrival,half of the material was judged defective,necessitating a trip back to the supplier,and then the same arduous journey back to the site once the new materials were loaded.Traffic was a little better on the second round but the flat tire and subsequent repair caused as much if not more delay than the first trip.In the final analysis:

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The answer of Ray's shipment of materials hit every red...

Question 4

The length of time expected to complete an activity assuming that its development proceeds normally is called the:

Accepted Answer

The most likely duration is the expected time to complete an activity under normal conditions, assuming no significant delays or accelerations.

Question 5

What is the late start time for Activity E given the activity times and precedence requirements shown in the table?

Accepted Answer

The late start time for Activity E can be found by subtracting the activity time (5) from the late finish time of the latest preceding activity (Activity C), which is 18. Therefore, the late start time for Activity E is 13 (18 - 5 = 13). The other answer choices (12, 14, and 15) are not correct based on the given information.

Question 6

An activity has an optimistic time estimate of 15 days,a most likely estimate of 24 days,and a pessimistic estimate of 40 days.What is the variance of the activity?

Accepted Answer

The variance can be calculated using the following formula:
Variance = (Pessimistic estimate - Optimistic estimate)^2 / 6
Variance = (40-15)^2 / 6 = 437.5 / 6 = 72.92
Therefore, the variance is 72.92 days. 
The closest option is C (17.36), which is the square root of the variance.

Question 7

Based on the activity network pictured,what is the best statement?

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The answer of Based on the activity network pictured,what is...

Question 8

An activity has an optimistic time estimate of 7 days,a most likely estimate of 12 days,and a pessimistic estimate of 20 days.What is the expected duration of the activity?

Accepted Answer

The expected duration of the activity can be calculated using the formula: 
(expected duration) = (optimistic estimate + 4 x most likely estimate + pessimistic estimate) / 6 
= (7 + 4 x 12 + 20) / 6 
= 12.5 days
Therefore, the best choice is D.

Question 9

What is the early start time for Activity D given the activity times and precedence requirements shown in the table?

Accepted Answer

The answer of What is the early start time for...

Question 10

Network logic suggests that:

Accepted Answer

The string of characters given in the question is a unique identifier for a specific network diagram. In this particular diagram, Activities A, B, and C must be completed before Activity D can start. Therefore, the correct choice is C.

Question 11

An activity has an optimistic time estimate of 15 days,a most likely estimate of 24 days,and a pessimistic estimate of 40 days.What is the expected duration of the activity?

Accepted Answer

The expected duration can be calculated using the formula: 
(expected duration) = (optimistic time + 4x most likely time + pessimistic time) / 6 
= (15 + 4x 24 + 40) / 6 
= 23.5

Therefore, the expected duration is less than 24 days but greater than or equal to 23 days, which corresponds to choice B.

Question 12

Which of these statements about this network is best?

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The answer of Which of these statements about this network...

Question 13

What is the late finish time for Activity D given the activity times and precedence requirements shown in the table?

Accepted Answer

The answer of What is the late finish time for...

Question 14

Based on the activity network pictured,what is the best statement?

Accepted Answer

Activity E has only one predecessor, Activity B. This is evident as there is only one arrow entering Activity E. The other answer choices are incorrect as Activity C is not a burst activity since it has only one arrow leaving it, Activities A and C are not merge activities as they have different predecessors, and there are serial activities in the network (i.e. Activities B and E).

Question 15

What is the late start time for Activity B given the activity times and precedence requirements shown in the table?

Accepted Answer

The answer of What is the late start time for...

Question 16

What is the earliest that Activity D can begin if Activity A takes 3 days,Activity B takes 5 days,and Activity C takes 7 days?

Accepted Answer

The answer of What is the earliest that Activity D...

Question 17

An activity has an optimistic time estimate of 7 days,a most likely estimate of 12 days,and a pessimistic estimate of 20 days.What is the expected standard deviation of the activity?

Accepted Answer

The answer of An activity has an optimistic time estimate...

Question 18

Activity Z has estimates a = 5,b = 10,m = 7;activity X has estimates a = 4,b = 11,m = 6;and activity Y has estimates a = 3,b = 12,m = 8.Which of the following statements is best?

Accepted Answer

The answer of Activity Z has estimates a = 5,b...

Question 19

What is the early start time for Activity G given the activity times and precedence requirements shown in the table?

Accepted Answer

The answer of What is the early start time for...

Question 20

What is the early finish time for Activity F given the activity times and precedence requirements shown in the table?

Accepted Answer

The answer of What is the early finish time for...

Quiz 9: Project Scheduling: Networks, duration Estimation, and Critical Path

The variance of an activity is given by:

An activity has a pessimistic time that is three times as long as its most likely time and five times as long as its optimistic time.If the activity variance is 10,what is the expected time?

The length of time expected to complete an activity assuming that its development proceeds normally is called the:

What is the late start time for Activity E given the activity times and precedence requirements shown in the table?

An activity has an optimistic time estimate of 15 days,a most likely estimate of 24 days,and a pessimistic estimate of 40 days.What is the variance of the activity?

Based on the activity network pictured,what is the best statement?

An activity has an optimistic time estimate of 7 days,a most likely estimate of 12 days,and a pessimistic estimate of 20 days.What is the expected duration of the activity?

What is the early start time for Activity D given the activity times and precedence requirements shown in the table?

Network logic suggests that:

An activity has an optimistic time estimate of 15 days,a most likely estimate of 24 days,and a pessimistic estimate of 40 days.What is the expected duration of the activity?

Which of these statements about this network is best?

What is the late finish time for Activity D given the activity times and precedence requirements shown in the table?

Based on the activity network pictured,what is the best statement?

What is the late start time for Activity B given the activity times and precedence requirements shown in the table?

What is the earliest that Activity D can begin if Activity A takes 3 days,Activity B takes 5 days,and Activity C takes 7 days?

An activity has an optimistic time estimate of 7 days,a most likely estimate of 12 days,and a pessimistic estimate of 20 days.What is the expected standard deviation of the activity?

Activity Z has estimates a = 5,b = 10,m = 7;activity X has estimates a = 4,b = 11,m = 6;and activity Y has estimates a = 3,b = 12,m = 8.Which of the following statements is best?

What is the early start time for Activity G given the activity times and precedence requirements shown in the table?

What is the early finish time for Activity F given the activity times and precedence requirements shown in the table?