Compute conditional probability as the fraction of one event's outcomes that also belong to another event.
Decide whether a conditional probability is possible, impossible, or undefined
Problem
Is this conditional probability possible, impossible, or undefined? \(P(A|B)=1.2\)
Big Picture
What this problem is really about
A defined conditional probability is a part-to-whole fraction within the conditioned group, so it must lie from zero through one. We’ll test the proposed value against that range, interpret it as a percent of the group, and distinguish an impossible out-of-range value from an undefined zero-denominator conditional.
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