What is a Random Variable?Space, Sample
A. They are all equal. B. They are all different. C. They are randomly distributed. D. They follow a normal distribution. 相关知识点: 试题来源: 解析 A。方差为 0 说明变量的取值没有波动,即所有值都相等。反馈 收藏
(甲午战争后)“今天,随便走进哪一家农户,人们都可以看到,曾经是不可缺少的纺车,都蒙上了尘土,被人遗忘了。一捆捆机器压的孟买棉纱似乎使人注意到手纺车已经不合时宜了。”(引自姚贤镐编:《中国近代对外贸易史资料》第三册)这种现象反映的实质问题是( )
结果1 题目 A random variable follows a continuous uniform distribution over 27 to 89. What is the probability of an outcome between 34 and 38() A. 0.0546. B. 0.0645. C. 0.0719. 相关知识点: 试题来源: 解析 B P(34≤X≤38)=(38-34)/(89-27)=0.0645. 反馈 收藏 ...
If a random variable Y follows a Poisson distribution with parameter λ = 3, what is the probability that Y = 2? A. 0.2240 B. 0.1991 C. 0.2408 D. 0.1494 相关知识点: 试题来源: 解析 B。本题考查泊松分布的概率计算。泊松分布概率公式为 P(X = k) = (λ^k * e^(-λ)) / k! 。
What is a Variable? The definition of a variable changes depending on the context. Typically, a letter represents them, and it stands in for a numerical value. In algebra, a variable represents an unknown value that you need to find. For mathematical functions and equations, you input their...
统计学,英文,A random variable X is given such that X ∼ N(82,126).a.One of the different values of X is chosen at random.If this value can be rounded to the nearest whole number,what is the probability that this whole number is 84?b.If we t
What is a variable declaration? A variable declaration is a statement that sets the name of a variable and its data type. It also provides information about where the variable should be stored in memory. This process can include initializing the variable with an initial value, although that is...
Suppose a discrete random variable has mean and the moment generating function for all , where and are unknown constants. What are the values of and ? A. and B. and C. and D. and 点击查看答案
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