If a set of standardized test scores is normally distributed,having a mean of 50 and a standard deviation of 10,approximately 68 percent of the group members receive scores somewhere between

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In a normal distribution, approximately 68% of the data falls within one standard deviation of the mean. Since the mean is 50 and the standard deviation is 10, one standard deviation above and below the mean would be 40 and 60, respectively.

If a Set of Standardized Test Scores Is Normally Distributed,having