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Re: A researcher has determined that she requires a minimum of n responses [#permalink]
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p=20, n=40



Answer - A
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Re: A researcher has determined that she requires a minimum of n responses [#permalink]
Hey Carcass and GeminiHeat, I understand the approach cbrelax's approach to this question but can the answer to this question be found by using some other method ?
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Re: A researcher has determined that she requires a minimum of n responses [#permalink]
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Say x individuals must be surveyed.

p% of the surveyed individuals fail to respond --> the number of individuals who did NOT fail to respond = \(x-x*\frac{p}{100}\).
The above must be equal to 2n, so:

\(x-x*\frac{p}{100}=2n\) --> \(x(1-\frac{p}{100})=2n\) --> \(x=\frac{200n}{100-p}\).

Answer: A.

Of course one can also use plug-in method to solve this problem.

A bit out of scope question but after all still good for practice
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Re: A researcher has determined that she requires a minimum of n responses [#permalink]
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