Answer:
51 and 64
Step-by-step explanation:
The Empirical Rule states that 68% of normally distributed data lies within one standard deviation of the mean.
Hence, if the mean is 57.5, one standard dev. above that is 57.5+6.5, or 64, and one standard dev. below the mean is 57.5-6.5 = 51.
Thus,
we can conclude that 68% of the students received scores between 51 and 64.