项目经理小李对一个小项目的工期进行估算时，发现开发人员的熟练程度对工期有较大的影响，如果都是经验丰富的开发人员，预计20天可以完成；如果都是新手，预计需要38天；按照公司的平均开发速度，一般26天可以完成。该项目的工期可以估算为 （ ） 天。
- A.26
- B.27
- C.28
- D.29
正确答案及解析
正确答案
解析
根据PERT计算：（最乐观工期+4×最可能工期+最悲观工期）/6，从题目中找出最乐观工期=20，最悲观工期=38，最可能工期=26，代入PERT公式，计算出（20+4×26+38）/6=27
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