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Get Full Access to Mathematics For The International Student: Mathematics Sl - 3 Edition - Chapter 23 - Problem 3
Get Full Access to Mathematics For The International Student: Mathematics Sl - 3 Edition - Chapter 23 - Problem 3

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# A supermarket has four checkouts A, B, C, and D. Management checks the weighing devices

ISBN: 9781921972089 446

## Solution for problem 3 Chapter 23

Mathematics for the International Student: Mathematics SL | 3rd Edition

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Problem 3

A supermarket has four checkouts A, B, C, and D. Management checks the weighing devices at each checkout. If a weighing device is accurate a Y is recorded; otherwise, N is recorded. The randomvariable being considered is the number of weighing devices which are accurate.a Suppose X is the random variable. What values can X have?b Tabulate the possible outcomes and the corresponding values for X.c Describe, using X, the events of:i exactly two devices being accurate ii at least two devices being accurate.

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2/5/16 Friday,February5,20111:48AM Q1 • 25thpercentile Median • Middle • 2ndquartile • 50thPercentile 1/29/16 Friday,January29,201611:42AM CategoricalData • Categoricaldatabreaksobjectsdownintodifferentfeatures ○ Ex.Brandofsoda ○ Ex.Ethnicity • Createdifferentcategoriesandseehowmanyobjectsareinthatcategory • Frequency,relativefrequency,percentfrequency ○ Frequency-countinghowmanythingsinthecategory ○ Relativefrequency-whatfractionofthetotaldoesthatgoesintothe whole(decimal) ○ Percentfrequencyisthesameasrelativefrequencybutitusespercent QuantitativeData • Quantitativedatadescribesobjectsbymeasurements ○ Ex.Weight,time,speed,notathingthatwecancount,butwecan measure • Doesn'thavecategories • Goingtohavemanytypesofoutputsandcanhavemanywaystorepresentit • Onewaytorepresentquantitativedataistomakeclasses ○ Wearegoingtomakeclasses(thataresimilartocategories),then frequency,relativefrequency,percentfrequency Ex.Chapter2Audit • AnAccountingfirmrecordsthetimetoaudit20companies(days) • Wedon'twantoverlappingclasses ○ Won'tmakesense(don'twanttocountsomethingtwice(uncertainty)) ○ Ourclassesneedtocoverourdata ○ Alldatapointsmustfitintoaclass ○ Allclassesmustbeevenlylabeled 1/27/16 Wednesday,January27,2016 11:56AM Frequency-theamountin

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