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课程 10 · 年级 7–9
Statistics and probability
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
Statistics answers "what is typical": mean, median (middle of the row), mode (most frequent). Grades 2,3,3,4,5: mean 3.4, median 3. Probability is a chance from 0 to 1: heads on a coin = 1/2, six on a die = 1/6. Multiply independent chances: two heads in a row = 1/4.
- ●Mean: add everything, divide by count
- ●Median: sort and take the middle
- ●Chance: favorable ÷ all outcomes
🎲 Lotto 6 aus 49: the jackpot chance is 1 in 139 million. Statistics explains why "almost won" means nothing.