Probability is a branch of mathematics that is widely
used in genetics, insurance, finance, medicine, sociological surveys,
marketing and science. We use **probability** to measure the ** chance** or ** likelihood** of an event (or events) occurring in the future.
Events
An **event** is something that may or may not occur at some time or
during some period in the future.
When we talk about events in terms of chances, we could make statements
such as:
"I will **probably **play tennis this summer"
"It isn't **likely** that I will be invited to play in the
Australian Open Tennis Tournament"
"My **chances** of winning Tattslotto are not very good"
We could describe the expected occurrence of an event (or events) with
the words probably, likely or chances. These words tell us something
about whether or not the event is expected to occur; but the statements
are very vague. We study and apply probability to enable us to
better quantify or measure the chance of an event (or events) occurring in
the future.
Probability Experiment
A **probability experiment **is a test in which we perform a number of trials to enable us to measure the chance of an event occurring in
the future. The results from a probability experiment may reveal a
known truth or lead us to discover something about the probability (or
chance) of an event occurring in the future.
A **trial** is a process by which an **outcome** is noted.
Throwing a die, tossing a coin, rotating a spinner and drawing a card
from a pack of playing cards are all examples of probability experiments. |