Casio FX-82AU PLUS Calculator User Manual


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26
Statistics
Thebuttonpressingsequenceforstatisticsisonpages12to15.
Remember!
· WhenyouhavefinishedenteringthedatayoumustpressCtotellthecalculator
thatyouhavecompletedenteringthescores.
· WhenyoupressSHIFT14 then2tobringupthevalueofthemeanyou
mustpressptodisplaythevalue.Thisisparticularlyimportantwhenyou
proceedtofindthesecondpieceofinformation,e.g.thestandarddeviation.
Practise your statistics skills with the following questions.
1 Setyourcalculatortostatisticsandturnthefrequencylistoff.
A Enterthescores16,19,5,11,15,12and9.
B Determinethevalueofthemean,(
x
)to2decimalplaces.
CWhatisthevalueofthestandarddeviation(
n
s
)to3decimalplaces?
DDeterminethesamplestandarddeviation(
1n
s
-
)correctto3decimal
places.
2 Clearthedatainthestatisticslist.Theeasiestwaytoclearthedataistoturnthe
calculatoroff.Alternatively,setthecalculatortocompthenbacktostatistics.
3 Setthecalculatortostatisticswiththefrequencyon.
A Enterthedatainthetableintothecalculator.
Scores Frequency
5 4
6 9
7 15
8 11
9 7
10 4
B Determinethesizeof n,thenumberofscores.
C Whatisthevalueofthemean?
D Determinethesizeofthestandarddeviationcorrectto3decimal
places.
4 Determinethemeanandstandarddeviationofthescoresinthefollowingtable.
Scores
10 11 12 13 14 15 16
Frequencies
15 12 5 8 10 13 6
Answers
1B
12.43x =
,
4.338
n
s
=
,
1n
s
-
=4.685 3Bn=50 C
7.4x =
D
1.356
n
s
=
4
12.7x =
,
2.079
n
s
=
©SueThomsonandShriroAustralia PTYLimited.Thispagemaybephotocopiedforclassroomuse.
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