完成某信息系统集成项目中的一个最基本的工作单元A所需的时间，乐观的估计需8天，悲观的估计需38天，最可能的估计需20天，按照PERT方法进行估算，项目在26天以后完成的概率大致为 （ ） 。
- A.8.9%
- B.15.9%
- C.22.2%
- D.28.6%
正确答案及解析
正确答案
解析
期望工期=（8+4?20+38）/6=21 标准差=（38-8）/6=5 26天与21天之间为1个标准差（而非±1个标准差），16天到26天之间为±1个 标准差，根据正态分布规律，故16天到26天之间完成的概率为68.26%，26天以后完成的概率=（1-68.26%）/2=15.87%。
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