I need help finding a way how to remember how to do problems like this type A variable has a mean of 80 and a standard d

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answerhappygod
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I need help finding a way how to remember how to do problems like this type A variable has a mean of 80 and a standard d

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I need help finding a way how to remember how to do problems
like this type A variable has a mean of 80 and a standard
deviation of 5. Using Chebyshev’s theorem, what percentage of the
observations fall between 70 and 90? Using Chebyshev’s theorem,
what percentage of the observations fall between 65 and 95?
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