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Means from Frequency Tables
A Learning Object produced by
Sidney Tyrrell, Coventry University,
as part of her National Teaching Fellowship project.
![Page 2: Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project](https://reader035.vdocument.in/reader035/viewer/2022070306/5519b2825503467a578b4672/html5/thumbnails/2.jpg)
![Page 3: Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project](https://reader035.vdocument.in/reader035/viewer/2022070306/5519b2825503467a578b4672/html5/thumbnails/3.jpg)
To find the mean number of letters you receive per day
• You might keep a record for 10 days of the number of letters you receive each day,
• and summarise the results in a table.
![Page 4: Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project](https://reader035.vdocument.in/reader035/viewer/2022070306/5519b2825503467a578b4672/html5/thumbnails/4.jpg)
like this
Number of letters per day frequency
5
2
3
3
4
2
![Page 5: Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project](https://reader035.vdocument.in/reader035/viewer/2022070306/5519b2825503467a578b4672/html5/thumbnails/5.jpg)
To find the mean it is important
• to remember you want the average number of letters per day.
• So need the total number of letters,
• and total number of days.
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The total number of letters is given by
Number of letters per day
frequency Letters x frequency
2 5
3 2
4 3
2 x 5 = 103 x 2 = 6
4 x 3 = 12
Total letters = 28
![Page 7: Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project](https://reader035.vdocument.in/reader035/viewer/2022070306/5519b2825503467a578b4672/html5/thumbnails/7.jpg)
and the total number of days is
Number of letters per day
frequency Letters x frequency
2 5
3 2
4 3
2 x 5 = 103 x 2 = 6
4 x 3 = 12
Total letters = 28days = 10
![Page 8: Means from Frequency Tables A Learning Object produced by Sidney Tyrrell, Coventry University, as part of her National Teaching Fellowship project](https://reader035.vdocument.in/reader035/viewer/2022070306/5519b2825503467a578b4672/html5/thumbnails/8.jpg)
days = 10 letters = 28
• The mean is
Total letters
Total days=
28
10= 2•8
The mean is 2•8 letters per day