摩根斯坦筆試題
摩根斯坦利數(shù)學(xué)題
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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