Estimating Probabilities from Experiments (Leaving Cert Mathematics): Flashcards

Probability estimated from experiments/surveys, not theory

No. of times event occurs ÷ total no. of trials

$\frac{\text{Successful trials}}{\text{Total trials}}$

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

$0.3 \times 300 = 90$

Use fact that all probabilities sum to 1