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= Here is a data set: 416 396 322 346 409 647 420 376 492 410 263 338 363 158 392 504 408 508 521 549 349 303 421 387 378 405 538 326