Please Help Me Solve, with Steps thank you!!

Here is a data set:

430	529	470	283
373	538	588	283
420	392	607	491
546	366	736	532
283	495	297	433
466	432	720	491
657	526	595	467

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 =