PMP:每日一题-26

2019.8.14每日一题:

Rather than use Triangular Distribution while doing Three Point Estimation you choose to use Beta Distribution.Based on your analysis and understanding you are confident that the project would be completed with a total cost of 108,000 $.You also estimate that a best case estimate would be 90000 $ while a worst case scenario would result in the costs incurred to shoot up to 138000 USD. What would the Three point Cost estimate be using Beta Distribution ?
A.112000 $
B.110000 $
C.101000 $
D.None of the above

在进行三点估算时,与使用三角分布相比,你更倾向选择使用Beta分布。基于你的分析和理解,你有信心完成一个总成本为108,000美元的项目。你估计最佳的案例成本估计值是 90000美元,而最坏的情况将导致成本预算高达138000美元的费用。在这种情况下使用Beta分布三点成本估算会有多少呢?
A.112000 $
B.110000 $
C.101000 $
D.以上都不是

参考答案:B
解析:问题说明我们应该使用三点估计,使用Beta分布。这个估计方法的公式是4a + b + c / 6,其中a =最可能估计,b =基于最佳案例情况的估计和c =基于最坏情况的估计。所以使用Beta分布的三点估计计算值是(4 * 108000)+ 90000 + 138000/6 = 660000/6 = 110000 $ ,参考PMBOK245。