Construct a grouped frequency distribution for the following 28 scores using a class width of 5.
23 20 18 22 12 14 21 23 16 21 22
21 16 18 27 30 17 24 21 27 19 29
25 23 28 24 19 18


OK here is where I am...
highest value 30
lowest value = 12
range of set 30-12= 18

but where do go from here?