So here is an example from the Ross' A First Course In Probability 8th ed.
Why did the author pick $k=10$ in part b? For that matter, how does one know which $k$ to pick when doing problems involving Chebyshev's Inequality?
2026-03-26 06:27:59.1774506479
Help in an example of Chebyshev's inequality
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$\mathrm{P}(40<X<60) = \mathrm{P}(-10<X-50<10) = \mathrm{P}(|X - 50| < 10)$