摩根斯坦利數(shù)學(xué)題
自己的背景實(shí)際上不適合這個(gè)職位，估計(jì)是當(dāng)分母了。把記得部分筆試題發(fā)出來，當(dāng)攢R
P了。希望能收到dream offer。
筆試的時(shí)候特別注意了一下，試卷的任何部分沒有關(guān)于試題內(nèi)容不能泄露的.要求。如果確
有這樣的要求，請(qǐng)斑竹刪除吧。
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.
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