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Which of the following provides the best definition of “the probability of event $A$”?

The number of times that event $A$ will occur in a large number of observations or trials

The number of times that event $A$ will occur in a series of $100$ observations or trials

The proportion of times that event $A$ will occur in $100$ observations or trials

The proportion of times that event $A$ will occur in a very large number of observations or trials

A decimal between $0$ and $1$ OR a percentage between $0\%$ and $100\%$.