Question: For data sets having a distribution that is approximately bell-shaped, the Round-off Rule the Range Rule of Thumb Chebychev's Theorem the Empirical Rule states that

For data sets having a distribution that is approximately bell-shaped, the Round-off Rule the Range Rule of Thumb Chebychev's Theorem the Empirical Rule states that about 68% of all data values fall within one standard deviation from the mean

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