quadratic fit {1,82.96},{2,86.23},{3,87.09},{4,84.28},{5,83.69},{6,89.18},{7,85.71},{8,85.05},{9,85.58},{10,86.95},{11,87.95},{12,89.44},{13,93.47} - Wolfram|Alpha

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Input interpretation:

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Least-squares best fit:

link to /input/?i=85.892-0.554201+x%2B0.07499+x%5E2&lk=1&a=ClashPrefs_*Math-
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Fit diagnostics:

link to /input/?i=59.294&lk=1&a=ClashPrefs_*Math-link to /input/?i=61.5538&lk=1&a=ClashPrefs_*Math-link to /input/?i=0.587122&lk=1&a=ClashPrefs_*Math-link to /input/?i=0.504546&lk=1&a=ClashPrefs_*Math-
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Plot of the residuals:

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