A. All values are zero B. The values are evenly distributed around zero C. There are no values D. The variable is not defined 相关知识点: 试题来源: 解析 B。解析:期望为零意味着变量的值均匀分布在零的两侧。选项 A 所有值为零不一定导致期望为零;选项 C 没有值不符合概率分布的概念;选项 D...
The following sections discuss how the expected value of a random variable is computed. Expected value of a discrete random variable When is adiscrete random variablehavingsupport andprobability mass function , the formula for computing its expected value is a straightforward implementation of the infor...
The expected value of a random variable is the weighted mean of the values that the random variable can take, where the weight is the probability that aparticular value is taken by the random variable.Springer New YorkConcise Encyclopedia of Statistics...
variable. If you haven’t seen those before, the simple definitions are as follows. A random variable is a variable that can have one of several values, each with a certain probability. The probabilities of each possible value are positive and add up to one. The expected value of a random...
The expected value of a random variable can be intuitively understood as the average outcome of the random variable. The expected value of a random variable is found by calculating a weighted average of its possible outcomes, where the outcomes are weighted by their probabilities. Review: Random ...
f(x), the expected value of the random variable is given by: Given that the random variable X is continuous and has a probability distribution f(x), the expected value of the random variable is given by: Example 1: The probability distribution of X, the number of red cars John meets ...
结果1 题目 4.Expected values of random variables The table below shows the probability distribution of a random variable Y.160.2170.3180.2190.3What is the expected value of Y?Write your answer as a decimal. 相关知识点: 试题来源: 解析 17.6 反馈 收藏 ...
A random variable is used to define some event and P(X=x) denotes the probability with which the specific value of the random variable can occur. The expected value is simply the weighted average of the observations, which means that observations ...
Find the expected value of the random variable. z912161821 P(z) 0.14 0.24 0.37 0.17 0.08 E(z) = ___ (Type an integer or a decimal.) Expectation of a Random Variable: The expected value of a random variable is simply the summation of all random variables multi...
Expected value (also known as EV, expectation, average, or mean value) is a long-run average value of random variables. The expected value also indicates