Probability symbols? (1 Viewer)

Inexorably Me · Oct 8, 2009

Hopefully someone can help me decipher this!
Q: Given that P(A)= 4/9, P(B)=2/9 & P(AB)= 1/9, find P(A[FONT=&quot]<!--[if gte mso 9]><xml> <u1:WordDocument> <u1:View>Normal</u1:View> <u1:Zoom>0</u1:Zoom> <u1:TrackMoves/> <u1:TrackFormatting/> <u1

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ontGrowAutofit/> <u1:SplitPgBreakAndParaMark/> <w

ontVertAlignCellWithSp/> <w

ontBreakConstrainedForcedTables/> <w

ontVertAlignInTxbx/> <u1:Word11KerningPairs/> <u1:CachedColBalance/> <u1:UseFELayout/> </u1:Compatibility> <u1:BrowserLevel>MicrosoftInternetExplorer4</u1:BrowserLevel> <u2:mathPr> <u2:mathFont u2:val="Cambria Math"/> <u2:brkBin u2:val="before"/> <u2:brkBinSub u2:val="--"/> <u2:smallFrac u2:val="off"/> <u2:dispDef/> <u2:lMargin u2:val="0"/> <u2:rMargin u2:val="0"/> <u2:defJc u2:val="centerGroup"/> <u2:wrapIndent u2:val="1440"/> <u2:intLim u2:val="subSup"/> <u2:naryLim u2:val="undOvr"/> </u2:mathPr> </u1:WordDocument> </xml><![endif]-->*concave up symbol*B)..Whats the concave up symbol mean& how would i do this question?Please &ThankYou! help much appreciated

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ontGrowAutofit/> <u4:SplitPgBreakAndParaMark/> <w

ontVertAlignCellWithSp/> <w

ontBreakConstrainedForcedTables/> <w

ontVertAlignInTxbx/> <u4:Word11KerningPairs/> <u4:CachedColBalance/> <u4:UseFELayout/> </u4:Compatibility> <u4:BrowserLevel>MicrosoftInternetExplorer4</u4:BrowserLevel> <u5:mathPr> <u5:mathFont u5:val="Cambria Math"/> <u5:brkBin u5:val="before"/> <u5:brkBinSub u5:val="--"/> <u5:smallFrac u5:val="off"/> <u5:dispDef/> <u5:lMargin u5:val="0"/> <u5:rMargin u5:val="0"/> <u5:defJc u5:val="centerGroup"/> <u5:wrapIndent u5:val="1440"/> <u5:intLim u5:val="subSup"/> <u5:naryLim u5:val="undOvr"/> </u5:mathPr> </u4:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <u7:WordDocument> <u7:View>Normal</u7:View> <u7:Zoom>0</u7:Zoom> <u7:TrackMoves/> <u7:TrackFormatting/> <u7

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ontGrowAutofit/> <u7:SplitPgBreakAndParaMark/> <w

ontVertAlignCellWithSp/> <w

ontBreakConstrainedForcedTables/> <w

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David.Lai · Oct 8, 2009

it means union, ie. together.

Trebla · Oct 8, 2009

$P(A \cup B) = P(A) + P(B) - P(A \cap B)$

In other words, the probability that A or B occurs equals the probability that A occurs plus the probability that B occurs less the probability that both A and B occur at the same time (otherwise you double count). Draw a venn diagram to see this.

Hence the answer is: 4/9 + 2/9 - 1/9 = 5/9

scardizzle · Oct 8, 2009

consider it like a venn diagram. The P(AUB) is the part where they dont intersect and P(AnB) is where the circles intersect.

Inexorably Me · Oct 8, 2009

Thanks guys!!

Very helpful indeed (Y) - but i guess i need to go learn some simple probability TT_TT

Probability symbols? (1 Viewer)

Inexorably Me

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David.Lai

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Trebla

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scardizzle

Salve!

Inexorably Me

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