Mean--Median--Mode--and-Range均值-中位数-模式-与范围-PPT课件

WHATDOTHEYALLMEAN?AnissaSaunders5thGradeMean•Istheaverageofasetofnumbers.Howisthemeanofasetofnumbersfound?•Addallthenumbersinthesettogether.•Dividethesumbythenumberofnumbersintheset.•Thequotientisthemeanofthesetofnumbers.•Example:20,15,25–Add20+15+25=60–Divide60by3–Themeanis20Median•Isthenumberthatisinthemiddleofasetofnumbers.•(Iftwonumbersmakeupthemiddleofasetofnumbersthenthemedianistheaverageofthosetwonumbers.)Howisthemedianofasetofnumbersfound?•Arrangethenumbersinthesetinorderfromleasttogreatest.•Themiddlenumberisthemedianofasetofnumbers.•Ifmorethanonenumberisinthemiddleofthesetofnumbers,theaverageofthosetwonumbersisthemedianofthesetofnumbers.•Examples:•10,15,20•15isthemedianofthissetofnumbers.•10,15,20,25•Add15+20=35•Divide35by2=17.5•Themedianofthissetofnumbersis17.5Mode•Isthenumberinasetofnumbersthatoccursthemostoften.HowdoIidentifythemodeofasetofnumbers?•Arrangethesetofnumbersinorderfromleasttogreatest.•Thenumberthatoccursthemostoftenisthemodeofthatsetofnumbers.•Example:•10,15,10,15,20,25,15,30•10,10,15,15,15,20,25,30•15isthemodeofthissetofnumbersbecauseitisthenumbersthatoccursthemost.Range•Isthedifferencebetweenthehighestandlowestnumbersinasetofnumbers.Howistherangeofasetofnumbersidentified?•Arrangethenumbersinthesetinorderfromleasttogreatest.•Subtractthelowestnumberfromthehighestnumberinthesetofnumbers.•Thedifferenceofthetwonumbersistherangeofasetofnumbers.•Example:•10,15,20,25,30,35,40,45,50•50–10=40•40istherangeofthissetofnumbers.It’sTimeToPractice!•1052550151040351020•5101010152025354050•Whatisthemean?•Theansweris10.•Whatisthemedian?•Theansweris17.5•Whatisthemode?•Theansweris10.•Whatistherange?•Theansweris45.