Summary events and outcomes

P event number of relevant outcomes
total number of outcomes
can
only be used for equally likely outcomes

Probabilities add to one




0.02
52


probability trees can be used to calculate the probability
of equally likely outcomes and not
we label the each
equally likely
probability of branch
R

H B


g B
T
Y

P TR
I


AND Events for equal outcomes
the product of probabilities

P A and B PCA P B

Outcomes as AND Events
where there are multiple actions we can treat outcomes as and
events e 2B 2 and B
g