The mean test score in Miss Smith's 4th grade English class is 72, with a standard deviation of 9. Assume the grades are normally distributed and use the Empirical Rule (68-95-99.7) to find the approximate percentage of students who scored below 63.
A. 84%
B. 2.35%
C. 47.5%
D. 2.5%
E. 16%
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