1
Q
probability measures …
A
the chance that an event will occur on a scale of 0-1 inclusive
usually expressed as a fraction
2
Q
p(outcome occurs)=
A
(no ways outcome can happen)/(total number of possibilities)
3
Q
capital letters denote …
A
events
4
Q
relationship between probability of event A and probability of event A’
A
p(A) = 1-p(A)
5
Q
events are mutually exclusive if…
A
they cannot occur at the same time
6
Q
events are independent if…
A
the occurrence of one does not affect the other
7
Q
events are dependent if…
A
the occurrence of one does affect the other
8
Q
the ‘OR’ rule/addition rule
A
p(A or B)= p(A) + p(B)
9
Q
the ‘AND’ rule/multiplication rule
A
p(A and B)= p(A) x p(B)
