Nested formula with some greaterthan/less than calculations

So, I have a field that returns a number. I need a formula that will return text based on that number:

less than 30 = poor
less than 50 = below average
50 to 60 = normal
60+ = above average
70+ = excellent

Thoughts? When I wrote it out, it would work for anything less than 50, but for anything more it always returns "normal". Got somthing to do with how it reads the > sign, I think, but I'm not sure.

Thanks!

Try LOOKUP

First, build a lookup table, in say E1:F5
E1:E5 = 0 30 50 60 70
F1:F5 = poor | below average | normal etc...

Then use
=LOOKUP(A1,$E$1:$E$5)
A1 is your field that returns a number.