What’s on the Probability of Two Events poster
The rule, 4 worked examples, and the mistake everyone makes.
- For independent events, multiply the probabilities for 'and'. For mutually exclusive…
- P(A and B) = P(A) × P(B)
- Two heads in a row = 1/2 × 1/2 = 1/4
- A 6 then a 6 = 1/6 × 1/6 = 1/36
- A 2 or a 5 on one die = 1/6 + 1/6 = 1/3
- Two aces, no replacement = 4/52 × 3/51
- Common mistake: always multiplying → check whether the first event changed the second
'And' narrows things down, so the answer gets smaller. 'Or' widens it, so it gets bigger.
Questions about the Probability of Two Events poster
- What’s on the Probability of Two Events poster?
- The rule, 4 worked examples, and the mistake everyone makes. For independent events, multiply the probabilities for 'and'. For mutually exclusive…; P(A and B) = P(A) × P(B); Two heads in a row = 1/2 × 1/2 = 1/4; A 6 then a 6 = 1/6 × 1/6 = 1/36; A 2 or a 5 on one die = 1/6 + 1/6 = 1/3; Two aces, no replacement = 4/52 × 3/51; Common mistake: always multiplying → check whether the first event changed the second. 'And' narrows things down, so the answer gets smaller. 'Or' widens it, so it gets bigger.
- Who is the Probability of Two Events poster for?
- Probability of Two Events 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 of Two Events poster?
- Draw the tree diagram. It makes independence visible. A wall chart earns its place by being glanceable from where the work is happening, so Probability of Two Events belongs on the wall where that math work actually happens, within glancing distance, rather than filed away.
- What other posters go with Probability of Two Events?
- Angle Pairs, Area of a Circle and Box Plots sit alongside Probability of Two Events 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.Angle PairsArea of a CircleBox Plots
- Is the Probability of Two Events poster free to download and print?
- Yes. Probability of Two Events 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 of Two Events poster print at?
- Probability of Two Events 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 of Two Events loses nothing.Printing guide
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Browse every 7th Grade poster, or start from the full catalogue.