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1、离散型随机变量及连续型随机变量 一般随机现象的结果可直接用数量来表示。当然,这些数量的取值,不能事先确定,而是受偶然因素的影响改变的。这种随偶然因素而改变的描述随机现象结果的变量就是随机变量。一般用ζ、η等字母来表示。有些随机现象的结果,虽与数量直接无关,但将其结果数量化以后,仍然与数量间接有关。如在产品检查中,抽取一个产品,结果可能是“正品”,也可能是“次品”,它本身不
1, discrete random variables and continuous random variables The results of the general random phenomenon can be directly expressed by the number. Of course, the value of these quantities can not be determined in advance, but by the influence of accidental factors change. This variable that describes the random phenomenon as a result of contingencies is a random variable. General ζ, η and other letters to represent. Although the results of some random phenomena are not directly related to the quantity, after quantifying the result, the quantity is still indirectly related. If the product inspection, taking a product, the result may be “genuine” may also be “defective”, which itself is not