Answer:
According to the empirical rule, 68% of 7-year-old children are between
68% of the values is within one standard deviation from the mean, that is mean ± standard deviation.
The empirical rule states that for a normal distribution, 68% of the values is within one standard deviation from the mean, 95% of the values is within two standard deviation from the mean while 99.7% of the values is within three standard deviation from the mean.
68% of the values is within one standard deviation from the mean, that is mean ± standard deviation.
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