Changing a data point
I can see how certain statistical measures may change as a result of changes in the data.
Changing a data point
I can see how certain statistical measures may change as a result of changes in the data.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Changing the value of one data point can affect the mode.
- Changing the value of one data point can affect the median.
- Changing the value of one data point can affect the mean.
Keywords
Bimodal - Sets of data which have two modes are known as bimodal data.
Mean - The (arithmetic) mean for a set of numerical data is the sum of the values divided by the number of values.
Median - The median is the central (middle) piece of data when a set of numerical data is in numerical order.
Mode - The mode is the most frequent value in a dataset.
Common misconception
Averages (mean, median, mode) will always change if a data point needs to be added, removed, edited.
The mean, median, or mode will remain invariant if a data point is added with the same value as that average.
To help you plan your year 8 maths lesson on: Changing a data point, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 maths lesson on: Changing a data point, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 maths lessons from the Numerical summaries of data unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
Starter quiz
6 Questions
3
4
-1
12
Exit quiz
6 Questions
The median becomes 4.
The median becomes 9.
The median stays the same.
The median becomes 8.
The mean increases by 2.
The mean decreases by 1.
The mean increases to 8.
The mean stays the same.
The mean decreases to 4.