Please explain both 15&16. I don't know how to answer letter C on both questions.

12. Placement Exams On a placement examination, Rick scored lower than 1210 of the 12,860 students who took the exam. Find the percentile, rounded to the nearest percent, for Rick's score. 13. Test Scores Kevin scored at the 65th percentile on a test given to 9840 students. How many students scored lower than Kevin? 14. Test Scores Rene scored at the 84th percentile on a test given to 12,600 students. How many students scored higher than Rene? 15. Median Income In 2015, the median family income in the United States was $66,650. (Source: U.S. Census Bureau) If the 90th percentile for the 2015 median four-person family income was $178,500, find the percentage of families whose 2015 income was a. more than $66,650. b. more than $178,500. c. between $66,650 and $178,500. 16. Monthly Rents A recent survey by the U.S. Census Bureau determined that the median monthly housing rent was $708. If the first quartile for monthly housing rent was $570, find the percent 20. of monthly housing rents that were a. more than $570. b. less than $708. c. between $570 and $708. 17. Commute to School A survey was given to 18 stu- dents. One question asked about the one-way distance the student had to travel to attend college. The results, in miles, are shown in the following table. Use the median procedure for finding quartiles to find the first, second, and third quartiles for the data