the result of an action
a collection of possible outcomes
P = (event) = number of favorable outcomes
total number of possible outcomes
COMPLEMENT OF AN EVENT
the collection of possible outcomes not contained in the event.
the sum of the probabilities of an event and its complement is 1
probability based on experimental data or observations
P (event) = number of times an event occurs
total number of trials
two events are independent if the occurance of one event does not affect the probability of the occurance of the other
If A and B are independent events,
then P(A, then B) = P(A) X P(B)
two events are dependent events if the occurrence of one event affects the probability of the occurrence of the other.
If event B depends on event A, then
P(A, then B) = P(A) X P(B after A)
an arrangement of items in a particular order
the product of all positive integers less than or equal to a number is the factorial for that number.
4 factorial is 4! = 4X3X2X1 (24)
a grouping of objects in which the order of the objects does not matter
combinations = total number of permutations
number of permutations of smaller group