某项目预计最快12天完成,最慢36天完成,21天完成的可能性最大。公司下达的计划是18天完成,要使计划完成的概率达到50%,在计划中需要增加 ( ) 天应急时间。
- A.4
- B.6
- C.8
- D.22
正确答案及解析
正确答案
解析
我们先计算出期望工期【(12+4*21+36)/6】,经过计算得出为22天。此时我们画图,22天所处的位置是整个图横轴的中心位置,即在横轴50%的位置。(因为期望工期计算出的为22,所以22肯定是在正中间)如下所示:

我们先计算出期望工期【(12+4*21+36)/6】,经过计算得出为22天。此时我们画图,22天所处的位置是整个图横轴的中心位置,即在横轴50%的位置。(因为期望工期计算出的为22,所以22肯定是在正中间)如下所示:

两个图形经过对比后,我们得知发现18、22都处于50%的位置。如下所示:

最终得出结论:公司计划值,距离22天还差4天。因此计划中需要增加4天应急时间。
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