Probability
PSAT · Flashcards · Recall
PSAT · FLASHCARDS
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QUESTION
What is the complement rule for an event
A
A
A
?
QUESTION
What is the formula for the expected value of a discrete variable with outcomes
x
i
x_i
x
i
and probabilities
p
i
p_i
p
i
?
QUESTION
What condition must hold for events
A
A
A
and
B
B
B
to be independent using conditional probability?
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ANSWER
P
(
A
∣
B
)
=
P
(
A
)
P(A\mid B)=P(A)
P
(
A
∣
B
)
=
P
(
A
)
. Independence means
B
B
B
doesn't change
A
A
A
's probability.
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