The mean monthly income of a group of college students is $500; the standard deviation is $50. According to Chebyshev's theorem, at least what percent of the incomes will lie between $400 and $600?

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The Answer of The mean monthly income of a group of college students is $500; the standard deviation is $50. According to Chebyshev's theorem, at least what percent of the incomes will lie between $400 and $600?

The Mean Monthly Income of a Group of College Students