Expected value is good and variance is bad because that's risk; that's uncertainty.

期望值越高越好,方差就相反,因为方差代表着风险,也就是不确定性

youdao

Some variance of temperature is to be expected.

预料气温会有些变化。

youdao

Some variance of temperature is to be expected.

预料气温会有些变化。

youdao