BDM Lecture 5

7/25/2019 BDM Lecture 5

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Lecture 5

Mean and Others

Higher National Diploma BTECUnit 6: Business Decision Making

Tutor: Solomon


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Mean, Median, Mode &

Range


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Mean, Median, Mode areall types of average. An

average summarisesgroups of data.


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Mean

Average often means the mean

Mean total of the num!ers divided!y ho" many num!ers.

#lass shoe si$es% , 5, 5, ', (, , ), *, 5, '

Add up the num!ers%

+ 5 + 5 + ' + ( + + ) + * + 5 + ' (

-ivide !y ho" many num!ers%

( * ( /he class mean shoe si$e is (


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Median

Median is the middle value 0ut the num!ers in order

#hoose the num!er in the middle of

the list. 1f there are ) num!ers in the middle

then it is half"ay !et"een them.

#lass shoe si$es% , 5, 5, ', (, , ), *, 5, '

0ut in order% *, ), , , (, 5, 5, 5, ', '

/he class median shoe si$e is (.5


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Mode

Mode is the most common num!er 0ut the num!ers in order

#hoose the num!er that appears the

most fre2uently. 3ometimes there may !e more than

one mode.

#lass shoe si$es% , 5, 5, ', (, , ), *, 5, '0ut in order% *, ), , , (, 5, 5, 5, ', '

/he class modal shoe si$e is 5.


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Range

Range is ho" far from !iggest tosmallest.

0ut the num!ers in order

/a4e the smallest num!er from thelargest.

#lass shoe si$es% , 5, 5, ', (, , ), *, 5, '

0ut in order% *, ), , , (, 5, 5, 5, ', '

3u!tract smallest from largest% ' * 5

Range% 5


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These are Abbys science test scores.

97 84

73 88

100

63

97 95

86


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What can you tell us about these

numbers?

97 84

73

88

100

63

97

95

86


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What is the MEAN

6o" do "e 7nd it8

The mean is the numerical

a!erage o" the #ata set$

The mean is "oun# %& a##ing all

the !alues in the set' then#i!i#ing the sum %& the num%ero" !alues$


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Lets find AbbysMEANscience test

score?

97

84

73

88100

63

97

95

86(

9:

9: ) ;

/he mean is *+


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Questions WelcomedQuestions Welcomed

BDM Lecture 5

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