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....
A random variable Xhas a mean of 25 and a standard deviation of 8.The random variable X- Yhas a mean of 9 and a standard deviation of10. Assuming Xand Yar independent what are the mean and standarddeviation of the random variable Y?(A) u_Y=16andσ_Y=2(B) u_Y=16andσ_Y=6(...
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%
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
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
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. 相关知识点: 试题来源: 解析 这个题是这样的。220-200 = 20是两个deviation以外。两个deviation以外的event...
【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...
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...
a. A random variable x has an exponential probability distribution with a mean of 13. What is the probability that 𝑥x is greater than 14? b. A random variable 𝑥x is uniformly distributed between 1 and 20. What is the probability that ...
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【 】 ...