mean function of stochastic process

例句：

1. 1. The mean function of a randomvariable is its expected value.
   随机变量的平均值是其期望值。
2. 2. Themean function of the populationdistribution is the average value ofall the individual values.
   总体分布的平均值是所有个体值的平均数。
3. 3. Themean function of the data set is theaverage value of all the data points.
   数据集中所有数据点的平均值是该数据集的平均函数。