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Frequency and probability. Geometric probability

Three ways to describe randomness
In grade 9 three ideas sit together: relative frequency (the share of successes in a run of trials), classical probability P=m/nP=m/n for equally likely outcomes, and geometric probability (ratios of lengths, areas, or volumes). A handy scale for how likely an event is: from 00 (practically impossible) to 11 (certain).
The same event can be judged from data (WW) or from a model (PP)
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