The probability of failure.
Actually, the phrases used have very confusing connotations. When studying the risk of people being killed by lightning strikes, a "success" or the "desired outcome" is death caused by lightning. I somehow doubt that the person struck would consider it a desired outcome or a success!
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It Is Called An Outcome :) ( YOur Welcome)
Well, that's not much of a question. Perhaps you are asking: What is the frequency interpretation of probability? This is called the classical interpretation of probability. Given n independent and identical trials with m occurrences of of a particular outcome, then the probability of this outcome, is equal to the limit of m/n as n goes to infinity. If you are asking: How can probabilities be estimated given data, based on frequency approach? A table is constructed, with intervals, and the number of events in each interval is calculated. The number of events divided by the total number of data is the relative frequency and an estimate of probability for the particular interval.
A dependent probability.
Impossible
it's an orbital