What’s on the The Mean poster
The rule, 4 worked examples, and the mistake everyone makes.
- Add every value, then divide by how many values there are. It is the balance point of…
- mean = total ÷ how many
- 4, 6, 8, 10 = 7
- 3, 3, 3, 3 = 3
- 2, 3, 4, 100 = 27.25
- Missing value = total − known values
- Common mistake: forgetting to divide by the count → always divide by how many values
The mean is easily pulled about by outliers. When data is skewed, the median is more honest.
Questions about the The Mean poster
- What’s on the The Mean poster?
- The rule, 4 worked examples, and the mistake everyone makes. Add every value, then divide by how many values there are. It is the balance point of…; mean = total ÷ how many; 4, 6, 8, 10 = 7; 3, 3, 3, 3 = 3; 2, 3, 4, 100 = 27.25; Missing value = total − known values; Common mistake: forgetting to divide by the count → always divide by how many values. The mean is easily pulled about by outliers. When data is skewed, the median is more honest.
- Who is the The Mean poster for?
- The Mean is filed under 6th Grade (ages 11–12), so it matches what that year asks a child to remember. It is equally useful to an older student revisiting math, and to the parent or teacher answering the question at the kitchen table.
- When should you use the The Mean poster?
- Ask what would happen to the mean if you added one enormous value. That is the weakness. A wall chart earns its place by being glanceable from where the work is happening, so The Mean belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
- What other posters go with The Mean?
- Median, Mode and Range, Absolute Value and Adding Integers sit alongside The Mean in the 6th Grade set. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Median, Mode and RangeAbsolute ValueAdding Integers
- Is the The Mean poster free to download and print?
- Yes. The Mean downloads as a free PDF with no account, no email and no watermark, like everything else in the 6th Grade set. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the The Mean poster print at?
- The Mean is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of The Mean loses nothing.Printing guide
Related posters
Charts that sit alongside The Mean on the same wall.
Browse every 6th Grade poster, or start from the full catalogue.