With CPM, estimates of activity durations are based on historical data and are assumed to be the mean or average time that the activity has taken to perform in the past.

CPM的活动历时估算通常以历史数据为基础，并且采用以往项目活动历时的平均值。

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Another important concept in probability theory that we will use a lot is expected value, the mean, or average — those are all roughly interchangeable concepts.

概率论中另外一个常用的重要的概念是，期望值或者也叫均值，这两个概念可以互换。

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Another important concept in probability theory that we will use a lot is expected value, the mean, or average — those are all roughly interchangeable concepts.

概率论中另外一个常用的重要的概念是，期望值或者也叫均值，这两个概念可以互换。

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