求一道概率题?what is the probability that a normal random variable has an outcome within 2.5 standard deviations of the mean?（我也能看出来用切克雪夫不等式,但是看不懂题意）

求一道概率题 求一道概率题?what is the probability that a normal random variable has an outcome within 2.5 standard deviations of the mean?（我也能看出来用切克雪夫不等式,但是看不懂题意） 简单概率题目一道求概率P(X 一道gmat数学概率题1≤n≤99,what is the possibility of n(n+1) is a multiple of SAT数学题概率题求解答If n and p are to be selected at random from sets N and P respectively,what is the probability the n/(2p) will be a member of set 求讲解解题思路N {12,18,2,6}P {1,4,2,3} 求算一道概率题 一道概率题,求解答 一道统计学题,A test of a null hypothesis gives a test statistic z=-1.6what is p-value if the alternative is Ha:u不等于u0? 概率统计一道题【正太分布Y ∼ N(52,25),求概率】,已知Y ∼ N(52,25).求 P(Y = 50).P=0 一道求边缘概率密度的题 求帮解答一道概率题 一道英文数学概率题A box contains 4 black cubes and 6 white cubes.A cube is drawn from the box.Its colour noted and a cube of the other colour is then added to the box.A second cube is then drawn.(a).If both cubes are of the same colour,what 一道英语口语题.选哪个答案,理由是什么?What do you suppose ____ A.What is the matterB.What is happenedC.What is the wrongD.What the trouble is what is the probability that headway is within 1 standard deviation of the mean value?求数学英语牛what is the probability that headway is within 1 standard deviation of the mean value?这题到底问啥啊这是个概率统计的题目。 一道英语IQ题What is the longest word in the world?要求详细说明原因! 问一道求数学期望和方差的题流水生产线上每个产品不合格的概率为P,0 求助一道有关随机事件的概率题已知AB=A拔B拔 求P(AB) What is the P.of Japan?P.是一个以字母P开头的单词.该题为填词题.