Since this is a concave function, it's not just the expected value.

由于这是一个凹函数，它不仅仅是期望值。

We have expected value, mean or average.

我们可以用期望值，或者是平均值。

What is the expected value of these risks?

这些风险的预期值是多少？

The more search, the higher the expected value of reward;

寻找越多，预期回报价值就越高；

The weighted mean of the random variable is the expected value.

随机变量的加权平均值是期望值。