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Mr Hewitts Year 8 Maths
Home
Volume
Area Revision
Introduction to Volume
Mixed Volume Questions
Drawing Solids
Composite Solids
Composite Cylinder Volume
Algebra
Substitution
Expanding Brackets
Factorising
Balancing Equations
3 Step Equations
Equations with Brackets
Pronumerals on Both Sides
Simple Quadratics
Extra Topics
Distance Speed Time
Percentage Increase and Decrease
Percentage Change
Rates & Ratios
Scales
Converting Units in Rates
Geometry
Classification
Angle Sum
Pythagoras
The Hypotenuse
The Short Sides
Applications of Pythagoras
Testing for Right Angles
Linear Relations
Tables of Values
Exam Revision
Coordinates
Single Variate Data Analysis
Mean Median Mode
Stem and Leaf (MMMr)
Frequency Table (MMMr)
Histograms (MMMr)
Outliers (MMMr)
Probability
Sample Space
Probabilities
Complement
Two Way Tables
Venn Diagrams
Drawing Venn Diagrams and Two Way Tables
Mr Hewitts Year 8 Maths
Home
Volume
Area Revision
Introduction to Volume
Mixed Volume Questions
Drawing Solids
Composite Solids
Composite Cylinder Volume
Algebra
Substitution
Expanding Brackets
Factorising
Balancing Equations
3 Step Equations
Equations with Brackets
Pronumerals on Both Sides
Simple Quadratics
Extra Topics
Distance Speed Time
Percentage Increase and Decrease
Percentage Change
Rates & Ratios
Scales
Converting Units in Rates
Geometry
Classification
Angle Sum
Pythagoras
The Hypotenuse
The Short Sides
Applications of Pythagoras
Testing for Right Angles
Linear Relations
Tables of Values
Exam Revision
Coordinates
Single Variate Data Analysis
Mean Median Mode
Stem and Leaf (MMMr)
Frequency Table (MMMr)
Histograms (MMMr)
Outliers (MMMr)
Probability
Sample Space
Probabilities
Complement
Two Way Tables
Venn Diagrams
Drawing Venn Diagrams and Two Way Tables
More
Home
Volume
Area Revision
Introduction to Volume
Mixed Volume Questions
Drawing Solids
Composite Solids
Composite Cylinder Volume
Algebra
Substitution
Expanding Brackets
Factorising
Balancing Equations
3 Step Equations
Equations with Brackets
Pronumerals on Both Sides
Simple Quadratics
Extra Topics
Distance Speed Time
Percentage Increase and Decrease
Percentage Change
Rates & Ratios
Scales
Converting Units in Rates
Geometry
Classification
Angle Sum
Pythagoras
The Hypotenuse
The Short Sides
Applications of Pythagoras
Testing for Right Angles
Linear Relations
Tables of Values
Exam Revision
Coordinates
Single Variate Data Analysis
Mean Median Mode
Stem and Leaf (MMMr)
Frequency Table (MMMr)
Histograms (MMMr)
Outliers (MMMr)
Probability
Sample Space
Probabilities
Complement
Two Way Tables
Venn Diagrams
Drawing Venn Diagrams and Two Way Tables
MMMR From Stem & Leaf Plots
Dot Plot
Steam and Leaf Plots
Back to Back Stem and Leaf
Websites
Videos
Learning Intention:
Sucess Criteria
To understand how to calculate measures of central tendancy and spread of data sets presented in stem and leaf plots
1. I can present the data from a stem and leaf or dot plot in an ordered list
2. I can find the mean, median, mode and range of various data sets presented in stem and leaf or dot plots
Dot plots
Dot plots contain values on a horizontal axis and a "dot" for each member of that group
To find the mean and median we write the data as an ordered list
0, 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4 14, 14, 15, 15, 15, 16, 16, 18, 18
We can then use these lists to find the mean and median:
The mode and range are usually easy to see from these plots, as the highest, lowest values and most popular value are all visibly located
Mode: 2 Range : 4 Mode: 15 Range: 4
Stem and Leaf Plots
We use the same method for steam and leaf plots. Ordered list for mean and median, visible method for mode and range.
Mean = 25.3
Median = 24.5
Mode = 23, 26 (bi-modal)
Range = 26
Some stem and leaf plots are "back to back" and you can be asked a variety of questions about them
Mean (S1) = 12.14 Mean (S2) = 15.83
Median (S1) = 13 Median (S2) = 14
Mode: No mode for either set
Range (S1) = 21 Median (S2) = 25
Mean (combined) = 13.85 Median (combined) = 13
Mode (combined) = no mode Range (combined) = 27
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