What is a Statistical Experiment?
All statistical experiments have three things in common:

The outcome of the experiment depends on chance.
A coin toss has all the attributes of a statistical experiment. There is more
than one possible outcome. We can specify each possible outcome (i.e., heads or
tails) in advance. And there is an element of chance, since the outcome is
uncertain.
The Sample Space

An event is a subset of a sample space  one or more sample
points.
Types of events

Two events are independent when the occurrence of one does not
affect the probability of the occurrence of the other.