Experimental probability is a term used in probability theory to describe the likelihood of an event occurring, based on statistical data from past experiments or observations. It can also be referred to as empirical probability, observed probability, or approximate probability. The concept of experimental probability is often used in fields such as science, engineering, and finance, where predictions must be made based on incomplete or imperfect information. Other synonyms for experimental probability include actual probability, observed relative frequency, and sample estimate probability. While there may be slight variations in these terms, they all ultimately describe the same fundamental idea of calculating probability through experimentation or observation.