某项任务由子任务Ⅰ（计划编制和批准）和子任务Ⅱ（计划实施）组成。项目经理认为子任务Ⅰ的乐观历时为3天，最可能为4天，悲观历时为8天；子任务Ⅱ的乐观历时为5天，最可能6为天，悲观历时为10天。根据估算，该任务估算历时为 （ ） 天。
- A.10
- B.11
- C.12
- D.13
正确答案及解析
正确答案
解析
用三点估算法，估算活动平均时间为（乐观历时 + 4 ? 最可能历时 + 悲观历时）/6计算可得，子任务Ⅰ的平均时间为4.5天，子任务Ⅱ的平均时间为6.5天。因此该任务估算历时为“4.5天 + 6.5天 = 11天”。故选B。
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