Probability

Question 1

P(A) is the probability of..

Answer 1

A happening

Question 2

P(A’) is the probability of…

Answer 2

A not happening, it’s also written as 1-P(A)

Question 3

P(A or B or Both) is the probability that…

Answer 3

A or B or both happen, this is also written as P(A U B)

Question 4

P(A ∩ B) is also written as P( A & B) and this is the probability that…

Answer 4

Both A and B happen

Question 5

P(A U B) =…

Answer 5

P(A) + P(B) - P(A ∩ B)

Question 6

If A and B are independent A doesn’t affect B, to show this we use P(A ∩ B) =…

Answer 6

P(A) * P(B)

Question 7

If A and B are mutually exclusive A can’t happen at the same time as B, this means P(A ∩ B) =…

Answer 7

0

Question 8

When solving probability with replacement….

Answer 8

The numerator and denominator change

Question 9

P( A given B) =…

Answer 9

P( A ∩ B) / P(B)

Question 10

A and B are independent if…

Answer 10

P( A given B) = P(A)

Question 11

When solving a probability tree…

Answer 11

Some variables have more than one probability. This can affect your answer