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Probability is a measure of the likelihood of an event occurring, and it is always expressed as a number between 0 and 1. A probability of 0 indicates that an event will not occur, while a probability of 1 indicates certainty that the event will occur. Any number outside this range, such as negative values or values greater than 1, cannot represent a valid probability.

Negative numbers are not valid in the context of probability because they do not have a meaningful interpretation in this framework. Probabilities must reflect a non-negative measure of likelihood, and a negative value, like -0.0004, suggests an impossibility or an error in calculation, making it unsuitable for representing the chance of any event.

Understanding how to interpret probabilities is crucial for analyzing events. Probabilities provide a quantitative way to express uncertainty and are used in various fields, including statistics and risk assessment. Recognizing that probabilities must be non-negative helps in evaluating whether a given number can logically represent the likelihood of an event.