Assume that 500,000 people take the GED exam (high school proficiency exam) each year and their scores form a normal distribution. What percent of students score within one standard deviation of the mean?

68.27%

Step-by-step explanation:

Assuming a normal distribution, the empirical 68-95-99.7 rule, determines that the percentage of students that score within one standard deviation of the mean is 68.27%, the percentage within two standard deviations is 95.45% and within 3 standard deviations is 99.73%.

Therefore, the answer is 68.27%.