Some Probability Formulas - Revision history

Connolly064: /* Some useful probability formulas */

2025-11-24T19:45:17Z

‎Some useful probability formulas

Ciskowskid: /* Some useful probability formulas */

2022-05-11T17:40:33Z

‎Some useful probability formulas

Ciskowskid: /* Some useful probability formulas */

2022-02-11T18:33:30Z

‎Some useful probability formulas

Ciskowskid: /* Some useful probability formulas */

2022-02-11T18:32:23Z

‎Some useful probability formulas

Ciskowskid: /* Some useful probability formulas */

2022-02-11T18:12:17Z

‎Some useful probability formulas

Ciskowskid: /* Some useful probability formulas */

2022-02-11T18:06:06Z

‎Some useful probability formulas

Ciskowskid: Created page with "== Some useful probability formulas == '''The Addition Rule''' Consider 2 events, ''A'' and ''B''. To find the probability that either ''A'' or ''B'' (or both) will occur, w..."

2022-02-11T17:58:32Z

Created page with "== Some useful probability formulas == '''The Addition Rule''' Consider 2 events, ''A'' and ''B''. To find the probability that either ''A'' or ''B'' (or both) will occur, w..."

New page

== Some useful probability formulas ==

'''The Addition Rule'''

Consider 2 events, ''A'' and ''B''. To find the probability that either ''A'' or ''B'' (or both) will occur, we can use the following formula, called the addition rule:

[[File:Addition_Rule_Formula.JPG]]

@@ Line 7: / Line 7: @@
 [[File:Addition_Rule_Formula.JPG]]
-We subtract the probability of both ''A'' and ''B'' occurring, as to not "double count" them. This can seen better by looking at the following Venn Diagram:
+We subtract the probability of both ''A'' and ''B'' occurring, as to not "double count" them. This can be seen better by looking at the following Venn Diagram:
 [[File:A_and_B_Venn_Diagram.JPG]]
@@ Line 13: / Line 13: @@
 '''Conditional Probability'''
-Sometimes we would like to know the probability of an event ''B''  occurring, given that another event ''A'' has already occurred. This in called conditional probability and we use the notation:
+Sometimes we would like to know the probability of an event ''B''  occurring, given that another event ''A'' has already occurred. This is called conditional probability and we use the notation:
 [[File:Condition_Probability_Notation.JPG]]
@@ Line 22: / Line 22: @@
 ''contributed by David Ciskowski''

← Older revision		Revision as of 17:40, 11 May 2022
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	[[File:Conditional_Probability_Formula.JPG]]		[[File:Conditional_Probability_Formula.JPG]]

−	''~~Contributed~~ by David Ciskowski''	+	''contributed by David Ciskowski''

← Older revision		Revision as of 18:33, 11 February 2022
Line 20:		Line 20:

	[[File:Conditional_Probability_Formula.JPG]]		[[File:Conditional_Probability_Formula.JPG]]
		+
		+	''Contributed by David Ciskowski''

← Older revision		Revision as of 18:32, 11 February 2022
Line 17:		Line 17:
	[[File:Condition_Probability_Notation.JPG]]		[[File:Condition_Probability_Notation.JPG]]

−	This is read as "The probability of B given A."	+	This is read as "The probability of B given A," and can be calculated as follows:
		+
		+	[[File:Conditional_Probability_Formula.JPG]]

← Older revision		Revision as of 18:12, 11 February 2022
Line 10:		Line 10:

	[[File:A_and_B_Venn_Diagram.JPG]]		[[File:A_and_B_Venn_Diagram.JPG]]
		+
		+	'''Conditional Probability'''
		+
		+	Sometimes we would like to know the probability of an event ''B'' occurring, given that another event ''A'' has already occurred. This in called conditional probability and we use the notation:
		+
		+	[[File:Condition_Probability_Notation.JPG]]
		+
		+	This is read as "The probability of B given A."

← Older revision		Revision as of 18:06, 11 February 2022
Line 6:		Line 6:

	[[File:Addition_Rule_Formula.JPG]]		[[File:Addition_Rule_Formula.JPG]]
		+
		+	We subtract the probability of both ''A'' and ''B'' occurring, as to not "double count" them. This can seen better by looking at the following Venn Diagram:
		+
		+	[[File:A_and_B_Venn_Diagram.JPG]]