When data are normally distributed, approximately of the values are within 1 standard
deviation of the mean, approximately are within 2 standard deviations of the mean, and
approximately are within 3 standard deviations of the mean.

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The Answer of When data are normally distributed, approximately of the values are within 1 standard
deviation of the mean, approximately are within 2 standard deviations of the mean, and
approximately are within 3 standard deviations of the mean.

When Data Are Normally Distributed, Approximately of the Values Are