1.expected value of a discrete random variable X(离散随机变量的预期值):E(X)=u=求和符号xP(X=x) 2.Binomial distribution Mean(二项分布平均值) 3.Standardized normal variable(标准化变量) 4.条件概率和独立事件 5.po
百度试题 结果1 题目For a random variable X the mean is μ and standard deviation is σ.(Var)((X-μ)σ) 相关知识点: 试题来源: 解析 (Var)((X-μ)σ)=(Var)( 1σX-μσ), etc.反馈 收藏
【题目】random variable X is normally distributed,with a mean of 25 and a standard deviation of 4.Which of the following is cloest to the inter-q uartile range for this distribution?$$ A 2 5 - 2 2 . 3 = 2 . 7 $$B$$ 2 7 . 7 - 2 2 . 3 = 5 . 4 C 2 7 . 7 / 2...
of a random variable (x) is given by f(x) = 2p for x = 1, f(x) = p for x = 2, f(x) = 4p for x = 3, f(x) = 0 otherwise Find the value of P, E(x) and Var(x). Also calculate P(X > 1). Solution [Expectation: 2.29 ; Variance: 0.7559 ; ...
Given that the random variable X is normally distributed with a mean of 80 and a standard deviation of 10, P(85≤X≤90) is: A. 0.5328. B. 0.3413. C. 0.1915. D. 0.1498. 你可能感兴趣的试题 单项选择题 关于输电距离、输电电压与输电容量之间的关系,最合适的说法是【 】 ...
GRE数学正态分布A random variable Y is normally distributed with a mean of 200 and a standard deviation of 10.比较 the probability of the event that the value of Y is greater than 220,与 1/6.下面为答案解析:(有些看不明 1-(50%
A normally distributed random variable X has a mean of 90. Given that the probability P(X < 85)≈ 0.16 :(1)find the proportion of scores between 90 and 95, i.e., find P(90< X < 95) (2)find anestimate of the standard deviation for the random variable X....
百度试题 结果1 题目X is a random variable with mean 5 and standard deviation 2.Find for:Y=-2X+3(1)(Y)(2)(Var)(Y) 相关知识点: 试题来源: 解析 (1)-7(2)16 反馈 收藏
The probability density function f(x) of a random variable X that is normally distributed is completely determined once the: A. mean and median of X are specified. B. median and mode of X are specified. C. mean and mode of X are specified. D. mean and variance of X are specified. ...
mean是平均数,是一组数据的总数量除以这组数据的总份数所得的商,standard deviation是标准差,是各个数据与平均数之差的平方的平均数的算术平方根.inter-quartile range 是四分位差,它是上四分位数(QL)与下四分位数(QU)之差.这道题目应该是选择A,希望我能帮助你解疑释惑. 解析看不懂?免费查看同类题视频...