Final answer:
Sarah's score at the median would place her in the 50th percentile.
Step-by-step explanation:
To determine the percentile in which Sarah's score falls, we need to understand the concept of percentiles. Percentiles represent the percentage of scores that fall below a particular score. In this case, since there are only 20 people taking the math test, it cannot form a normal distribution. However, we can still determine the percentile based on the number of people who scored below Sarah.
If Sarah scores at the median, it means that 50% of the people scored below her. Therefore, she would be in the 50th percentile. This means that she scored better than 50% of the people who took the test.