Conditional Probability Flashcards
(6 cards)
1
Q
expectation of a discrete random variable
A
it is defined as E(X) = sum(x*P(X=x)), it Is also referred as expected value of X or the mean of X
2
Q
Variance of discrete random variable X
A
is Var(X) = E{(X - E(X))}
3
Q
standard deviation
A
it is a square root of the variance of X
4
Q
second equation of variance
A
Var(X) = E(X^2) - {E(X)}^2
5
Q
E(aX +- bY +- c)
A
aE(X) +- bE(Y) +- c
6
Q
Var(aX +- bY +- c )
A
a^2Var(X) + b^2Var(Y)
