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。
System is initialized by a group of random solution and search optimization value by iteration.
系统初始化为一组随机解，通过迭代搜寻最优值。
They provide no value and are near random.
短期图表几乎是随机的，提供不了任何价值。
They provide no value and are near random.
短期图表几乎是随机的，提供不了任何价值。
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