Answer :
In a normal distribution of scores, approximately 68 percent of all scores will occur within one standard deviation from the mean
Since a normal curve is bell-shaped and completely represented by its mean, mode, and standard deviation, Concerning the mean and standard deviation of a normal curve, we determine the approximate proportion of data that falls within certain intervals., the empirical rule gives the solution to it which is the 68-95-99.7% .The rule says that approx 68% of the data fall within one standard deviation of the mean and 95% of data fall within two standard deviations of the mean and at last99.7% of data fall within three standard deviations of the mean.
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