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12 cards from this deck
Probability estimated from experiments/surveys, not theory
No. of times event occurs ÷ total no. of trials
Successful trialsTotal trials\frac{\text{Successful trials}}{\text{Total trials}}Total trialsSuccessful trials
Probability that an event will occur
More trials → relative frequency closer to true probability
Probability × number of trials
Equals 1
Larger sample size/more trials
Approaches theoretical probability
When outcomes aren't equally likely in real-life situations
0.3×300=900.3 \times 300 = 900.3×300=90
Use fact that all probabilities sum to 1
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