The data represent the time, in minutes, spent reading a political blog in a day. Construct a frequency distribution using 5 classes. In the table, include the midpoints, relative frequencies, and cumulative frequencies. Which class has the greatest frequency and which has the least frequency?

1,7,19,14,7,13,16,9,7,11,7,0,6,8,18,17,12,0,15,10