Question 261920
According to Chebyshev's theorm at least 84% lies between what two numbers. 
I understand the theorm is supposed to be 2.5 Standard deviations but I don't see how that number is reached using the Formula. I get caught on the Algebra when the numbers are simplified to the point of
1-(1/K^2) = 0.84
1/k^2 = .16 
k^2 = 1/0.16
k = 1/0.4
k = 2.5

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Cheers,
Stan H.