I want to compute $P(Z \geq 3.26)$ with Z ~ $ \chi^2(4 )$ The tables only contain the p-values.
For example: https://www.medcalc.org/manual/chi-square-table.php
2026-04-30 02:55:56.1777517756
Chi-squared distribution/ probability
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I'm afraid that you can't find the answer in the tables. Using WolframAlpha/Mathematica function: $$\textrm{1 - CDF[ChiSquareDistribution[4], 3.26]}$$ The answer turns out to be about $0.515295$. You could have technically find this value in the tables but you would have to have p-value of $0.484705=1-0.515295$ (or something approximate like $0.5$) in the columns. With current version of your tables you can only tell that the value you are looking for is between $0.025=1-0.975$ and $0.8=1-0.2$ as your number is between $0.484$ and $5.989$.