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Math Help - Chebyshev's Theorem

  1. #1
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    Chebyshev's Theorem

    The mean amount spent by all customers at an organic food market is estimated to be $48, and the standard deviation is estimated to be $12. According to Chebyshev's Theorem, at least what percentage of customers would be expected to spend between $27 and $69? Express your answer to two decimal places and show step by step work

    im lost
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  2. #2
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    Re: Chebyshev's Theorem

    What does Chebyshev's theorem say?

    (Is the standard deviation 12 or 21?)
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