A公司的某项目即将开始，项目经理估计该项目10天即可完成，如果出现问题耽搁了也不会超过20天完成，最快6天即可完成。根据项目历时估计中的三点估算法，该项目历时的估算方差为（）
- A.2.1天
- B.2.2天
- C.2.3天
- D.2.4天
正确答案及解析
正确答案
解析
本题考查对项目进度中活动历时估算的掌握。
根据《系统集成项目管理工程师教程》的“活动历时估算所采用的主要方法和技术”节所介绍的三点估算法：
活动的历时=（最乐观历时+4×最可能历时+最悲观历时）/6
=（6+10×4+20）/6=66/6=11
活动历时方差=（最悲观历时-最乐观历时）/6=（20-6）/6=2.3
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