The Probability of Sure Event is:
The probability of a sure event is always 1 or 100%.
In probability theory, the probability of an event is a measure of the likelihood that the event will occur. The probability of any event ranges from 0 to 1, where 0 indicates impossibility and 1 indicates certainty. A sure event is one that is guaranteed to happen, and therefore, its probability is 1.
For a sure event, every outcome in the sample space is a favourable outcome, as the event is certain to occur. Therefore, the probability of a sure event is calculated as:
P (Sure Event) = Number of Favourable Outcomes/Total Number of Possible Outcomes
Since the number of favourable outcomes is equal to the total number of possible outcomes for a sure event, the probability simplifies to:
P (Sure Event) = Total Number of Possible Outcomes/Total Number of Possible Outcomes = 1
This demonstrates that the probability of a sure event is indeed 1, indicating complete certainty of its occurrence.