Here is a data set:

391 344 271 253

292 274 331 213

302 249 421 266

179 346 311 262

278 263 247 400

325 307 340 245

292 270 324 367

Construct a grouped frequency distribution table (GFDT) for this data set. You want 10 classes with a "nice" class width. Your classes should be labeled using interval notation. Each class contains its lower class limit, and the lower class limits should all be multiples of the class width. In that the data appears to be discrete, use a closed-interval to label each class.

Data range Frequency