68.0% of the data will lie between 12 and 26
Empirical rule
Empirical rule states that for a normal distribution, 68% are within one standard deviation from the mean, 95% are within two standard deviation from the mean, 99.7% are within three standard deviation from the mean.
68% = mean ± standard deviation = 19 ± 7 = (12, 26)
68.0% of the data will lie between 12 and 26
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