• Random tests never generate negative inputs
• Name TestAdd is a copy/paste mistake
• Initial solution fails to compile in a way confusing for the potential target audience of this simple kata
• Fixed tests should be properly organized into tested cases instead of a shapeless blob of FixedTests testing everything
• Feedback of failing tests could be improved, to help newbies to find their mistakes

You can check F# tests of the Even or Odd kata which, hopefully, can serve as an example for setup of tests.

The point was to hand-write a recursive function :)

If you're sorting by itself, cant you just do .sorted instead?

God this is an ugly language

The code comment clearly says:

;Be sure to return longs. We don't want to return Clojure Ratios!

Probably tests are poorly written as you said. You can simply use a float for the dividend to get a decimal number instead of a ratio.

(/ 5.0 2)
=> 2.5

I propose the solution

(float 5/2)
=> 2.5

Right, the test doesn't match the problem, which means this entire kata is really poorly written or I'm still missing something.

Looks like the tests don't cover that.

How is this correct? It returns Ratios.

(find-average [1 2 3 4])
5/2

You probably don't want to use (def) within a defn like that. I believe it'll conditionally polute the namespace. If you never call it, all_points and average won't be defined on the namespace (which is good), but if you do call it, they will be defined on the namespace. Consider using let instead.