Lesson 0 of 11
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Show on a big screenA coin spins before a cricket match. A ludo player waits for a six. A bag hides marbles of three colours. None of these can be called for sure. To call a result is to name it first. Yet each one can be measured.
This is Chapter 7 of your textbook. It is called The Mathematics of Maybe.
- Random — one result cannot be called. A long run of tosses can be described.
- A scale from 0 to 1 — chances lie between impossible and certain.
- Counting what happened — a chance from real trials.
- More tries, steadier — the share steadies as the tries grow in number.
- Counting what could happen — a chance from the set-up itself.
- When the two disagree — real rolls against the worked-out chance.
- Two things at once — a table of pairs.
- A tree of results — the same pairs, stage by stage.
A quick catch-up
These earlier ideas help. Open any to refresh it first.
- A fraction has a place on the number line.
- Divide by the whole. Then a share is a percentage.
- A ratio compares two amounts. The question decides which two.
- A new reading changes a running average.
- A claim can fit nine cases and fail the tenth.
- One try can fool you. Many tries show more.