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travel jewelry case wholesale Indicates a random phenomenon (under certain conditions, the phenomenon of the same results is always called random phenomenon) variables (all possible sample points). For example The number of calls received by the exchange station within a certain period of time, etc., are all examples of random variables.
The possible result of a random test (called basic event) form a basic space ω. Random variable x is definition of definition The value on the basic space ω is a function that is real, that is, each point in the basic space ω, that is, each basic event has the point on the real axis and it corresponds to it.有正面朝上,反面朝上两种,若定义X为投掷一枚硬币时正面朝上的次数,则X为一随机变量,当正面朝上时,X取值1；当反面朝上时, X takes the value of 0. Just like, roll a dice, all its possible results are 1, 2, 3, 3, 4, 5, and 6 o'clock. Then X is a random variable, and the value of x takes 1,2,3,4,5,6.6.
when there are 1,2,3,4,5,6 points appear at 1,2,3,4,5,6 points. Random variables are described. For example, the position of the bullets requires two coordinates to be determined. It is a two -dimensional random variable. Similarly, in the random phenomenon described by N random variables. Vector. Describe the value of the random vector, use a combined distribution function. The distribution function of each random variable in the random vector is called the edge distribution function. It is independent of each other. Independence is an important concept unique to the theory of probability.
In different conditions due to accidental factors, it may take different values, with uncertainty and randomness. However, the probability of these values in a certain range is certain. This variable is called a random variable. Random variables can be discrete or continuous. If the measurement value in the analysis test is a probability, take the probability to take it at probability that the probability is taken from probability. The random variable of the values may be randomly changed within a certain range. What value is not determined before the measurement, but the measured results are determined, and the measured value obtained by multiple repeated measurement is that the values obtained by repeated measurement have the measurement value obtained. Statistical regularity. The essence of the uncertainty of random variables and fuzzy variables is that the measurement results of the latter are still uncertain, that is, fuzzy.