Probability Flashcards
(8 cards)
1
Q
Mutually exclusive
A
no outsome where both events satisfy both conditions
2
Q
intersection
A
meets condition A and B
A ∩ B
3
Q
union
A
meets condition A or B
A U B = P(A) + P(B) - P(A∩B)
4
Q
Conditional probability
A
P(A|B) is the probability of A if B is true
P(A|B) = P(A∩B)/P(B)
5
Q
General Multiplication Rule
A
P(A∩B) = P(B) * P(A|B)
6
Q
Independence
A
if P(A) = P(A|B), then P(A∩B) = P(A) * P(B)
outcome of one event has no influence on the outcome of the other
7
Q
mean/expected value
A
multiple all values of the variable by their probability then add them together
P(A)A + P(B)B ….
8
Q
Discrete variable
A
random variables have a finite # of possible values
