某项目由ABCDE五个活动构成，完成各活动工作所需要的最可能时间Tm、最乐观时间To、最悲观时间Tp见下表：
各活动之间的信赖关系如下：
则该项目工期的估算结果约为 （ ） 天。
- A.22
- B.23
- C.24
- D.25
正确答案及解析
正确答案
解析
先找出关键路径：关键路径是：1-3-5-6，求B，D，E 3个活动的最可能时间之和，B是（5×4+2+10）/6，D是（7×4+3+15）/6，E是（10×4+6+20）/6，3者相加等于24。
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