Probability is a way of expressing
knowledge or belief that an event will occur or has occurred.
http://en.wikipedia.org/wiki/Probability
Frequency
probability is the interpretation of probability that defines an event's probability as the limit of its relative frequency in a
large number of trials.
Definition
Frequentists talk about probabilities only when dealing with
well-defined random experiments. The set of all possible outcomes
of a random experiment is called the sample space of the experiment. An event is defined as a particular subset of the sample space that
you want to consider. For any event only one of two possibilities can happen;
it occurs or it does not occur. The relative frequency of occurrence of an
event, in a number of repetitions of the experiment, is a measure of the probability of that event.
Thus, if n_{t} is the total number of trials and n_{x} is the number of trials where the event x occurred, the probability P(x) of the event occurring will be approximated by the relative
frequency as follows:
.
(Our solved example in mathguru.com
uses this concept)
http://en.wikipedia.org/wiki/Frequency_probability
The above explanation is copied from
Wikipedia, the free encyclopedia and is remixed as allowed under the Creative
Commons Attribution- ShareAlike 3.0 Unported License.