what are the answers and how do I figure this out?

Here is a data set: 261 254 278 264 71 268 304 274 265 266 71 214 212 285 287 319 258 354 221 Construct a grouped frequency distribution table (GFDT) for this duca set. You want 10 classes with a "nice" class width. Your classes should be labeled using INTERVAL NOTATION, with brackets ex [0, 99]. 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 (meaning brackets) to label each class. Data range Frequency