What is a characteristic of a probability of an event?

• A. It can be less than zero
• B. It can be more than one
• C. It ranges from zero to one
• D. It is always a whole number

Answer: (C)

The characteristic that defines the probability of an event is that it ranges from zero to one. This interval indicates that the likelihood of an event occurring cannot be negative (which would imply a non-existent event) and cannot exceed one (which would suggest that an event is certain to occur more than once in a single trial). A probability of zero means that the event is impossible, while a probability of one indicates that the event is certain to happen. This range is fundamental to the concept of probability, making option C the correct choice. Understanding this characteristic helps in analyzing different events and their likelihoods accurately in various scenarios, such as statistics and risk assessment.