The data represent the​ time, in​ minutes, spent reading a political blog in a day. Construct a frequency distribution using classes. In the​ table, include the​ midpoints, relative​ frequencies, and cumulative frequencies. Which class has the greatest frequency and which has the least​ frequency?
10. 9. 5. 19. 17
13. 2. 0. 4. 10
1. 16. 9. 7. 3
15. 17. 18. 16. 6