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As it actually has fluctuation, the demand is treated as stochastic variable.
由于实际中需求具有波动性，将需求作为随机变量来处理。
So it is the important subject in probability to study the independence of stochastic variable.
因而，关于随机变量的独立性的研究构成了概率的重要课题。
Market demand is a stochastic variable which brings difficulty for most profit by ordering right goods.
市场需求量是一个随机变量，它给订货者追求最大利润，确定最优订货量带来了困难。
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