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Nov 18, 2015 at 17:47 comment added Silverfish That's better, thanks. I'd be tempted to mention why the original poster (OP) has "overthought" the problem - since it's only necessary to find $P(X=0)$, there's no need to use a normal approximation.
Nov 18, 2015 at 17:44 comment added Kontorus Is this better, or should it be more vague?
Nov 18, 2015 at 17:42 history edited Kontorus CC BY-SA 3.0
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Nov 18, 2015 at 17:41 comment added Silverfish Have a look at our self-study question guidelines. We generally prefer to give hints, rather than a complete answer. Could you edit this answer to make it more of a hint than a full solution?
Nov 18, 2015 at 17:26 review Low quality posts
Nov 18, 2015 at 17:42
Nov 18, 2015 at 17:08 history answered Kontorus CC BY-SA 3.0