84% of the students have grade point averages that are at least 2.16
Empirical rule
Empirical rule states that for a normal distribution, 68% are within one standard deviation from the mean, 95% are within two standard deviation from the mean, 99.7% are within three standard deviation from the mean.
68% = mean ± standard deviation = 2.61 ± 0.45 = (2.16, 3.06)
The percentage of the students have grade point averages that are at least 2.16 = 68% + (100% - 68%)/2 = 84%
84% of the students have grade point averages that are at least 2.16
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