Group numerical data into class intervals

Here are the values of the number of pages in novels borrowed from a library, for a sample of 24: 111, 145, 260, 210, 162, 235, 217, 209, 261, 124, 255, 220, 128, 212, 125, 230, 196, 213, 240, 121, 226, 106, 163, 196

All listed values are whole numbers. Each interval includes both written endpoints; the next whole number starts the next interval

Use class intervals of width 25, starting at 100: 100–124, 125–149, 150–174, 175–199, 200–224, 225–249, 250–274