Posted by joyce on Thursday, April 25, 2013 at 8:22pm.
If the probability of an event happening is 2/5, then the probability of the event not happening is 3/5? This is False. The answer is 1/3. Explain why the answer is 1/3

Math  PsyDAG, Friday, April 26, 2013 at 2:26pm
If you are solely dealing with chance, the correct answer is 3/5 of not happening. However, if there is some additional information of nonchance events, this might be the factor. Is there more data?
Another possibility is that the 1/3 answer is a typo.
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