Answer :
Final answer:
Approximately 68% of all scores will occur within one standard deviation from the mean in a normal distribution.
Explanation:
In a normal distribution, approximately 68% of all scores will occur within one standard deviation from the mean.
This is known as the Empirical Rule, which states that about 68% of the data falls within one standard deviation of the mean in a bell-shaped distribution. This rule applies to any data set with a normal and symmetric distribution.
For example, if the mean is 80 and the standard deviation is 5, you can expect approximately 68% of the scores to be between 75 and 85.
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