suppose that the random variable x and y are independent,and they all follow the exponential distribution of parameter ,,then =
where is a joint cdf for some bivariate random vector .
suppose . let . then binomial.
suppose there are two events and . if , then .
suppose for and otherwise, what value of makes a well-defined pdf?
let and be two random variables with finite expectations. if then .
suppose follows a geometric distribution with pdf . then the value of is
企业通过向后纵向整合获得对产品分销渠道的控制。
under what circumstances can the second type of error occur?
suppose a discrete random variable has mean and the moment generating function , for all , where and are unknown constants, then the values of and are
化妆的原则
suppose population x~n(,4), where is unknown, is the sample from the population, the sample mean is , and the sample variance is , then the non-statistic of the following is
当运输供给能够充分满足运输需求时,运输量与运输需求相同。
the variance of the sample is the second central moment of the sample.