David W. answered • 11/07/16
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P(A)=0.6 is function notation. P [that is, the function] is the dependent variable; A is the independent variable. This means the point (A,0.6) is on the P-A graph.
In statistics, P(A) is the probability that event A will occur. Probability is defined as P=(number of successful events) / (number of possible events).
Suppose A is the event that a "fair" two sided-coin lands as heads (note: "fair" means equally-likely and is important at the start of sports events, etc.). P(heads)=0.5.
Lots of other probability distributions exist.
