S1 Probailty Flashcards
0
Q
How would P(A|B) be found?
A
probability of A and B happening
Probability of B
1
Q
What does P(A|B) mean?
A
The probability of A happening, given B happening.
2
Q
How can you tell if 2 events are independent?
A
If you multiply the probability’s of the two events together, it will be the same as the conditional probalitly.
3
Q
What do you use when the order matters or doesn’t matter?
A
Permutations when it matters, combinations when it doesn’t matter.
4
Q
Why are combinations used with the lottery?
A
Because the order of the numbers doesn’t matter.
5
Q
What does P(A∪B) mean?
A
The probability of A, Or B Or A and B
6
Q
How is P(A∪B) found?
A
P(A)+P(B)-P(A∩B)
14
Q
What does mutually exclusive mean?
A
The two events can’t happen at the same time.
