Question

Which of the following statements is true?

Group of answer choices

1)The variance of the time taken to complete an activity is equal to (b − a)/6.

2)The critical path is the path with the largest probability of being completed on time.

3)The standard deviation of a project completion time is the sum of the standard deviations for the critical path activities.

4)Three time estimates are necessary so that we can estimate the parameters of the Beta distribution.

thanks

Answer 1

From the given choices the 4th answer is true because the activity duration (expected duration of the activity) follows beta distribution curve which is defined by three parameter such as a optimistic time, most likely time, pessimistic time.

1 is false because the variance of the time taken to complete an activity is equal to (b − a)2/6.

2 is false because critical path has only 50% probability

3 is false because standard deviation of a project completion time is square root of the sum of the variances for the critical path activity.