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I have the pattern below:

$$ \begin{array}{ll} age (years) & remainder \\\hline 0 & 100\% \\ 20 & 66.7\% \\ 100 & 50\% \\ 300 & 40\% \\ 1000 & 33.3\% \end{array} $$

I need an equation which indicates above decaying pattern.

Mefitico
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gireesh kumar raju Muddaluru
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  • You're not going to get one unless you try it yourself here...? – Parcly Taxel Jul 14 '17 at 19:49
  • Try and explain to us what your problem is, what you already tried, and what is the context of this problem (the maths you're studying right now). Otherwise we can't help you. – Furrane Jul 14 '17 at 19:50
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    Have you tried plotting it in a spreadsheet? Excel will do an exponential fit and give you the parameters. – Ross Millikan Jul 14 '17 at 19:58
  • plot remainder vs. log (year) – G Cab Jul 15 '17 at 10:30
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    @GCab: the first value is problematic. –  Aug 28 '18 at 18:23
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    An exponential model such as $a+be^{-ct}$ does not work well, the initial decay is too large. Can you give more hints about the underlying physical model ? Do you know the final value ? –  Aug 28 '18 at 18:24

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