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why probability should always lie between 0 and 1
Probability is a numerical measure of the likelihood that an event will occur. Thus probabilities can be used as measures of the degree of uncertainty associated with events.

Probability values are always assigned on a scale from 0 to1 .A probability near zero indicates an event will unlikely to occur; a probability near one indicates an event is almost certain to occur. Other probabilities between 0 and 1 represent degrees of likelihood that an event will occur. For example if we consider the event rain tomorrow. When the weather report indicates a near zero probability of rain it means almost no chance of rain. However, if a .90 probability of rain is reported, we know that rain will occur. A .50 probability indicates that rain is just as likely to occur as not.


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