146 BPM
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4/4 ×2
Drag rhythmic values into up to 8 beat blocks per line to build a drum groove, or click a tile then click a block to place it — handy on a trackpad.
Math skill: Find a Row Total From a 2x2 Joint Frequency Table
How the beat teaches it: Every slot gives all four cell counts of a joint frequency table for events A and B — add the two cells in A's row to find A's marginal total. Build that many notes anywhere in the kit.
This is lesson 17 of 24 in RockBlocks Math, Probability, a free course where every lesson turns a math idea into something you can count, hear, and play. The previous lesson, “Size of a Joint Sample Space,” covered find the Joint Sample Space Size for Two Independent Variables. Next is Lesson 18, “Conditional Expectation.”
Every slot above (A, B, C, D) is its own question, and it’s a real, blank RockBlocks beat the whole time — the same drag-and-drop tiles, kit, tempo, sheet music, and drummer view as anywhere else on the site. Tap ❓ Questionin the corner to read the current slot’s problem, build your answer right in the grid, then tap ✓ Check Answerto grade it. Once you’re done, keep going: expand the beat, drop it into a Stack, or save a copy to your own page — nothing here overwrites the lesson itself, so every visitor still starts from the same blank slots.