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**White_Owl****Member**- Registered: 2010-03-03
- Posts: 99

How to find *n* in the equation:

Here cdf_binomial() is a distribution function of binomial random variable:

By trial and error I found that n=164. But is it possible to express *n* for a direct calculation? How did people solve such problems before the age of computers?

*Last edited by White_Owl (2013-04-07 13:29:24)*

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,582

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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