Math Equations
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8 Terms
Probability experiment
An action, or trial, that has varying results
Two events are independent events…
when the occurrence of one event does not affect the occurrence of the other event
P(A and B) = P(A) * P(B)
Two events are dependent events…
when the occurrence of one event does affect the occurrence of the other event
P(A and B) = P(A) * P(B|A)
Conditional probability
Measures the probability of event B given event A had occured
P(B|A) = P(A and B)/P(A)
2 events are disjoint or mutually exclusive…
When they have no outcomes in common meaning P(A and B)= 0
P(A or B) = P(A) + P(B)
Overlapping events
When they have one or more outcomes in common meaning P(A and B) ≠ 0
P(A) + P(B) - P(A and B)
Permutation
An arrangement of objects in which order is important
nPr = n! / (n-r)!
Combination
A selection of objects in which order is not important
nCr = n! / (n-r)! * r!