help me understand

Here is a data set: 306 334 297 298 335 318 315 313 306 364 315 301 335 272 289 366 296 307 329 317 313 272 366 336 294 300 317 350 The goal is to construct a grouped frequency distribution table (GFDT) for this data set. The GFDT should have 10 classes with a "nice" class width. Each class should contain its lower class limit, and the lower class limits should all be multiples of the class width. This problem is to determine what the class width should be. What is the range of this data set? range = Using this information, if the goal is to have 10 classes, what is the nicest class width? optimal class width =