What’s on the Probability poster
The rule, 4 worked examples, and the mistake everyone makes.
- Probability is the number of favourable outcomes divided by the total number of equal…
- P(event) = favourable ÷ total
- Rolling a 4 on a die = 1/6
- Rolling an even number = 3/6 = 1/2
- P(not A) = 1 − P(A)
- Impossible / certain = 0 / 1
- Common mistake: I got three heads, so tails is due → each flip is still 50/50
Theoretical probability is what should happen. Experimental is what did. They converge over many trials.
Questions about the Probability poster
- What’s on the Probability poster?
- The rule, 4 worked examples, and the mistake everyone makes. Probability is the number of favourable outcomes divided by the total number of equal…; P(event) = favourable ÷ total; Rolling a 4 on a die = 1/6; Rolling an even number = 3/6 = 1/2; P(not A) = 1 − P(A); Impossible / certain = 0 / 1; Common mistake: I got three heads, so tails is due → each flip is still 50/50. Theoretical probability is what should happen. Experimental is what did. They converge over many trials.
- Who is the Probability poster for?
- Probability is filed under 7th Grade (ages 12–13), 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 Probability poster?
- Ask how many outcomes there are in total before counting the ones you want. A wall chart earns its place by being glanceable from where the work is happening, so Probability belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
- What other posters go with Probability?
- Solving Proportions, Operations with Rational Numbers and Scale Drawings sit alongside Probability in the 7th Grade set. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Solving ProportionsOperations with Rational NumbersScale Drawings
- Is the Probability poster free to download and print?
- Yes. Probability downloads as a free PDF with no account, no email and no watermark, like everything else in the 7th 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 Probability poster print at?
- Probability 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 Probability loses nothing.Printing guide
Related posters
Charts that sit alongside Probability on the same wall.
Browse every 7th Grade poster, or start from the full catalogue.