Respectfully, no. You're research isn't up to snuff.
The quote you provided has zero primary sources. It doesn't even have secondary sources. All it has is a bunch of Google results, where its misattribution is repeated (as if that makes it therefore true). Have you ever noticed how you never see that quote with an actual reference?
In the Nichomachean Ethics, irregardless of translations, your quote is absent. That quote you've shared is made up, not the product of a translation. Consult the Ethics themselves. A translator does not take a 30+ word sentence, cut it by a third, alter the meaning of the statement, and then let it pass. That is a paraphrase--and the one you've quoted is not even a paraphrase of any translation of the Ethics itself.
Look at the content of the statement from the Ethics. It is not the same as what you've posted. That should give you a full stop right there.
Goodreads is wrong. Your acceptance of the attributed quote is an error. When you're looking for a 'fair amount of sources' regarding quotations attributed to a philosopher who wrote in another language in another time, it's best to stick with the consensus of those who study and translate that philosopher and the primary and secondary source material available. There are myriad Aristotle experts who specialize in his works and translate them. You will find that none of them attribute your quote to Aristotle.
Note how the Wikipedia page does not include the quote you posted. Note how the Ethics does not contain the quote you posted--not in any translation. Why? Because Aristotle never said it, and the quote you've picked up from the internet is not saying the same thing.
I really wasn't trying to be rude. The rational thing to do here is to update your beliefs based on evidence. Your quote is not a bad quote. It's just not Aristotle's. The translations, though they may differ in some wording, carry the same meaning (which the internet-Aristotle-quote does not):
[paraphrase mine]
> An educated mind is noted by its ability to be satisfied by the precision allowed by a given subject, while not demanding exactitude where only approximation can be attained.
Of course, there's the second part of the quote (in some translations), where Aristotle expounds (again, paraphrase mine):
> The educated person would not ask a rhetorician for scientific proof of his statements; neither would she ask a mathematician to reason in probabilities alone.
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I was trying to be helpful, not argumentative. Since you're still wanting to stand your ground that your quote is actually from Aristotle, I have to point out that your sources are unreliable to reference in proving your point. Go to the primary sources, not other websites that are re-quoting the same quote you did. That's as kindly as I can put it without just dismissing this as you refusing to update your beliefs based on sufficient evidence.
It's attributed to Metaphysics (http://www.goodreads.com/work/quotes/2479557), Nichomachean Ethics -- as you said (http://ancienthistory.about.com/od/aristotleworks/a/121610-A...), and Wikiquote (http://en.wikiquote.org/wiki/Aristotle). cmd+f (or ctrl) for 'educated' to find it in the last two links for it also appears slightly different from your version.