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自己的背景实际上不适合这个职位，估计是当分母了。把记得部分笔试题发出来，当攒R P了。希望能收到dream offer。 笔试的时候特别注意了一下，试卷的任何部分没有关于试题内容不能泄露的要求。如果确 有这样的要求，请斑竹删除吧。 1. X is a uniform distribution random variable between [0,1], Y=Ln(x). What i s the range of values Y can take, and Y's probability distribution function. 2. X and Y are independent normal distribution random variables with mean 0 a nd standard deviation 1. Prove that Z=X+Y is also a normal distribution rando m variable. What's Z's mean and standard deviation? What's the correlation co efficience between X and Z. 3. A binary random variable is a random variable that takes only 2 values 0 a nd 1. A and B are binary random vriables with Probability(A=1) = 0.3 Probability(B=1) = 0.5 What is the min and max correlation between A and B. 4. Find all solutions to the following ordinary differetial equations. f(x)''+2f(x)'+f(x)=2. （责任编辑：职场达人） |
