Accurate? (iwinyoulose4315)

Race #146

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Official speed 114.68 wpm (38.82 seconds elapsed during race)
Race Start March 3, 2020 10:11:55pm UTC
Race Finish March 3, 2020 10:12:34pm UTC
Outcome No win (2 of 2)
Opponents 1. redtr1 (118.88 wpm)
Accuracy 98.0%
Points 122.33
Text #3640570 (Length: 371 characters)

Property (c) is known as countable additivity. It is not something that can be proved, but it is like an assumption or an axiom. In our experience, we have seen that operating as if the assumption is correct leads to useful and credible answers to many problems, so we accept it as a reasonable assumption. Not all probabilists agree that countable additivity is natural.