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Distribution of time for project as a whole will be
  • a)
    Normal distribution
  • b)
    β-distribution
  • c)
    Both a and b
  • d)
    None of the above
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Distribution of time for project as a whole will bea)Normal distributi...
PERT is almost identical to the Critical Path Method(CPM) technique except it assumes each activity duration has a range that follows a statical distribution.
  • In PERT the Normal Distribution is used for the completion time of the project.
  • PERT uses three-time estimates for each activity. Basically, this means each activity duration can range from an optimistic time to a pessimistic time, and a weighted avenge can be computed for each activity.
  • Because project activities usually represent work, and because work tends to stay behind once it gets behind, the PERT developers chose an approximation of the beta distribution to represent activity durations.
  • The activity durations can be skewed more toward the high or low end of the data range.
  • Figure (A) depicts a beta distribution for activity duration that is skewed toward the right and is representative of work that tends to stay late once it is behind.
  • The distribution for the project duration is represented by a normal(symmetrical) distribution shown in figure (B).
  • The project distribution represents the sum of the weighted avenges of the activities on the critical path.
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Distribution of time for project as a whole will bea)Normal distributionb)β-distributionc)Both a and bd)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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