Here is a data set:

405	275	273	303
379	336	312	375
360	238	356	364
296	318	284	319
373	410	344	332
447	341	292	328
264	294	265	202

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 and the first lower class limit should be. What is the best class width for this data set? optimal class width = What should be the first lower class limit? 1st lower class limit =