Thread: help with classes

Hi;
have some raw data ie
5 8 5 34 34 88
33 67 54 67 89
1 4 65 8 4 6 87

How can workout how many classes should have?

Thanks.

ok just read about how to determine class size determined by the range and always round up ie largest value-smallest vaue 89-1=88(88 values per class I don't think so).

So how is it dertermned?

cearly its the extreme values that are affecting the class sizes so I guess I could split the classes as I see
fit?

ie I could put single values in a class 1 4 5 6 8 (class size 5) then the 30s 40s and 50s together 33 34 35 (class size 3) and then 60s 70s and 80s together
65 67 87 88 89 (class size 5) is this ok?

Thanks.