The formula for the empirical or experimental probability of an event P(E) is given by:

The experimental or empirical Probability of an event P(E) is given by:

$\text{P}\left(\text{E}\right)=\frac{\mathrm{Number} \mathrm{of} \mathrm{trials} \mathrm{in} \mathrm{which} \mathrm{the} \mathrm{event} \mathrm{happened}}{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{trials}}$

Empirical probability is the experimental probability that depends on past data or historical data.

Experimental or empirical probability is the probability of an event based on the results of an actual experiment conducted several times.