A project activity involves digging a large number of post holes deep into the g

Question

A project activity involves digging a large number of post holes deep into the ground. When you ask the team that will be responsible for completing this activity to develop an effort estimate for the project schedule, they respond that the effort is driven significantly by the specific soil conditions.

From history, they tell you that about 20% of the holes will take 20 hours each, 70% of the holes 40 hours and 10% of the holes 100 hours each.

What is your effort estimate for the activity and why?

Explanation / Answer

Effort estimate of the activity of digging large number of post holes will be decided on basis of average expected time involved in digging a hole.

Average expected time of activity involving digging for post holes would be equal to

= Sum of all ( Percentage of holes / 100 x Time taken per hole )

Thus effort estimate for the activity of digging post holes in this case ( hours )

= 0.20 x 20 + 0.70 x 40 + 0.10 x 100

= 4 + 28 + 10

= 42 hours

EFFORT ESTIMATE OF THE ACTIVITY OF DIGGING A POST HOLE = 42 HOURS

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