## Algebra 1: Common Core (15th Edition)

You have to find out what percent of scores were less than or equal to 7.5. They were 9 scores that were less than or equal to 7.5. They were 15 scores. So using this information we write a ratio, 9: 15. We divide to get a percent: $\frac{9}{15}$ =0.6. To change into a percent you move the decimal 2 times to the right to get 60%. So the percentile rank of a score of 7.5 is 60.