Difference between revisions of "Basic relationships in probability"

Latest revision as of 19:53, 27 August 2020

If events A and B are mutually exclusive then: {{{ P(A or B) = P(A) + P(B) }}}

If events A and B are non mutually exclusive then: {{{ P(A or B) = P(A) + P(B) - P(A and B) }}}

If events A and B are independent then: {{{ P(A and B) = P(A) X P(B) }}}

If events A and B are dependent then:

A)

Where P(B | A) is the probability that B occurs given that A already happened.

@@ Line 1: / Line 1: @@
-Basic relationships in probability
+* [[Mutually exclusive events|Mutually exclusive events]]
+* [[Non-mutually exclusive events|Non-mutually exclusive events]]
+* [[Independent events|Independent events]]
+* [[Dependent events|Dependent events]]
+If events A and B are ''mutually exclusive'' then:
+{{{
+P(A or B) = P(A) + P(B)
+}}}
+If events A and B are ''non mutually exclusive'' then:
+{{{
+P(A or B) = P(A) + P(B) - P(A and B)
+}}}
+If events A and B are ''independent'' then:
+{{{
+P(A and B) = P(A) X  P(B)
+}}}
+If events A and B are ''dependent'' then:
+{{{
+P(A and B) = P(A) X  P(B | A)
+}}}
+Where P(B | A) is the probability that B occurs given that A already happened.
+Part of [[M7-Quantitative Decision Methods-S2 - Probability and decision trees|M7-Quantitative Decision Methods-S2 - Probability and decision trees]]
 [[Category:mbi]]