Casio FX-82AU PLUS Calculator User Manual


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32
Waiting time investigation
Onaverage,howlongdocustomerswaitinyourschoolcanteenqueuebeforetheyhave
completedtheirpurchases?Inthisactivityyouwillbeinvestigatingthisquestionandevaluating
theresults.
Equipment required
· Awatchthatmeasurestimeinminutesandseconds
· Penandpaperforrecordingresults
· ACasiofx82AUPLUScalculator
What you have to do
· Ingroupsof3assigneachpersononeoftherolesoftimer,recorderorcustomerselector.
· Arrangefordifferentgroupstomeasurecustomerwaitingtimesatthebeginning,middle
andendofbuyingtimes.
· Tomakesureyourresultsarevaliditisimportanttochoosearandomsampleof
customerstotime.The‘customerselector’willusethecalculator’srandomnumber
generatortochoosecustomers.SetthecalculatortoLine10andfixthedisplaytoshow2
decimalplaces.WhenyoupressSHIFT. pthecalculatorwillshowadecimal
number.Iftherandomnumberislessthan0.50selectthenextcustomerthatjoinstheline
totime.Eachtimeyoupresspanotherrandomnumberwillbedisplayed.
· The‘timer’measuresthetimefromwhentheselectedcustomerjoinsthequeueuntilthey
moveawayfromthecounter.
· Recordthetimeforatleast10randomlyselectedcustomers.
Calculating the mean (average) time
· SetthecalculatortostatisticsbypressingMODEthen2(forstats)then1(for1
VAR).
· Usethe xbuttontoenterthewaitingtimesinminutesandseconds.e.g.enter2minutes
and35secondsbypressing2 x 35 x andthecalculatorwilldisplaythe
amountautomaticallyas2.5833minutes.AfteryouhaveenteredallthetimespressC.
ThenpressSHIFT1(stats) 4(Var).Thescreenoptionsshowthatpressing2will
givethemean.Press2thenptofindthemeanofthetimes.Thecalculatorwillshow
thetimeasadecimal.PressSHIFTx toshowthetimeinminutesandseconds.
Evaluating your results
· Comparetheresultsfromdifferentgroups.Aretheythesame?Iftheyaredifferent
suggestareasonforthedifference.
· Usetheinformationtodeterminewhethercustomershavetowaittoolong.Ifthetimes
aretoolong,canyousuggestawaytoshortenthetime?
Who is interested in your results?
Writeareportofyourinvestigationandyourfindings.Givethereporttosomeonewhocan
implementanysuggestionsyoucanmake.
©SueThomsonandShriroAustraliaPTYLimited.Thispage maybephotocopiedforclassroomuse.
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