9.7 probability

Heyyyy today lets talk about probability!

First lets be clear about some vocabulary:

 Independent event: the occurrence of one event has no event has no effect on the second event    Complement of an event: probability that the event does not occur

Experiment: the result is uncertain

Outcome: possible results

Probability= n(E)/ p(E) must be between 0 and 1 

If p (E) = 0, impossible event 

If p(E)= 1, certain event 

Mutually exclusive event: P( A U B)= P(A) + P (B) - P(A n B) 

Independent event P (A and B) = P(A)X P(B)

Complement: P(A')= 1-P(A)

Example : if there are 3 red marbles, 2 black marbles and 5 yellow, what is the probability of picking out one red marble?

 P = 3/10