Study notes
Statistics & Probability
Quartiles, spread (range, IQR, standard deviation), cumulative frequency and box-and-whisker plots, and probability of combined events.
What this topic covers
- Quartiles split ordered data into four equal parts
- Range and interquartile range (IQR) measure spread
- Standard deviation measures spread from the mean
- A cumulative frequency diagram lets you read off the median and quartiles
- A box-and-whisker plot displays the five-number summary
- Combined events use the addition and multiplication rules
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