Final answer:
Without specific data, we cannot determine the exact percent of students scored below 64. The question is likely related to percentiles in student performance, but the provided information doesn't include relevant data for this particular score.
Step-by-step explanation:
To answer the question of what percent of students scored below 64, we need additional context or data, such as the distribution of scores or results from a particular test or study. Without that information, we cannot provide an accurate percent. However, based on the given Solution 2.21, we can deduce that this question might relate to an examination or survey where percentiles are used to assess student performance. In such cases, percentiles and probability calculations are common methods used to determine the percentage of students scoring at or below a certain score.
The details shared within the question excerpts hint at various statistical outcomes related to student performance, such as the 90th percentile being at 69.4, meaning that in this case, 90 percent of students scored below this figure. However, none of these details directly address the percent of students scoring below 64.