Mathematics Class 9
The Mathematics of Maybe: Introduction to Probability
Turn everyday chances into numbers from 0 to 1, using counts, tables and trees.
11 lessons · ~82 min total
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Lessons in this topic
- 0 Start here A roadmap: randomness, the 0-to-1 scale, counting chances two ways, and reading tables and trees. · 4 min You are here
- 1 What random means The next toss cannot be called, but a whole run of tosses can be described. · 8 min
- 2 A scale from 0 to 1 A chance is a number from 0 to 1, and one complete set of chances adds to exactly 1. · 8 min
- 3 Counting what happened An observed chance is a count over the whole run of trials, not over part of it. · 8 min
- 4 More tries, steadier The observed share settles as tries grow, but it need not equal one number exactly. · 8 min
- 5 Counting what could happen A worked-out chance counts the outcomes an event allows, once they are checked equally likely. · 8 min
- 6 When the two disagree Observed and worked-out chances can differ. With few rolls, a gap is normal. · 8 min
- 7 Two things at once Two actions make a table of pairs, and "exactly one head" is two cells, not one of three. · 8 min
- 8 A tree of results A tree draws the same pairs in stages, and the chances along a path multiply. · 8 min
- 9 The big picture Eight ideas on one screen: counting a chance from trials, from the set-up, from a table and from a tree. · 6 min
- 10 Track quiz A cheat-sheet table plus a reveal quiz, one question per idea. · 8 min
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