This doesn't make much sense. Are you saying you want to get the maximum value from a field in the table? What does split into 10 mean? Do you mean that you want to select the 10 highest values of a field in a table?
Echo it in a select? I'm assuming you mean place this/these value/s in a select form field?
What have you got so far? Not sure how you expect us to help without any info about the table / fields.