Mathematics Class 10
Probability
Chance = wanted ÷ all. Spinners, dice, coins, cards — and the checks that catch a wrong answer.
16 lessons · ~93 min total
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Lessons in this topic
- 0 Start here What this chapter is about, in one picture. · 3 min You are here
- 1 Chance = wanted ÷ all Probability = favourable outcomes ÷ total outcomes, when every outcome is equally likely. · 5 min
- 2 Two spinners, one grid Two spinners together: write each result as a pair, one cell of a grid each. · 6 min
- 3 Two dice, 36 pairs Two dice make 36 equally likely pairs. The 11 sums are not equally likely. · 6 min
- 4 0, 1, or in between Every probability is from 0 to 1. An impossible event has 0. A sure event has 1. · 5 min
- 5 Count the slips, not the numbers Each slip is one outcome, even when two slips show the same number. · 5 min
- 6 "Not" means 1 minus P(not E) = 1 − P(E). A shortcut when the direct count is long. · 6 min
- 7 "Or" means count each one once For A or B, count every outcome once. A shared outcome must not be counted twice. · 6 min
- 8 All together, step by step One question, every step: count all, check equal chances, count wanted, use the rule, check. · 6 min
- 9 Coins: list every result Toss one, two or three coins. List every result in order, then count the ones you want. · 7 min
- 10 A pack of 52 cards A pack has 4 suits of 13 cards. Count the cards that fit the question, out of 52. · 8 min
- 11 Words that pick numbers Read each number word, such as prime or between. Then list the numbers. · 7 min
- 12 One taken out, not put back A marble kept out changes the total, and its own colour. Recount before the next draw. · 7 min
- 13 Checkpoint: coins, cards, numbers and draws Five quick checks on coins, cards, number words and kept-out draws. · 5 min
- 14 The big picture The whole chapter on one screen. · 3 min
- 15 Track quiz Twelve quick questions, one for each lesson. · 8 min
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