When it comes to this test... no I am not.

15, I beat the chimp!

I dove into the JS to retrieve the chart data. Here are the chimpanzee's results (converted by me to % of all recorded outcomes). The chart data implies but does not show that no chimps succeeded at >=25. So if you got an impressive 20 correct, chimpanzees might still beat you 0.5% of the time.

   0: 0.00%
   1: 0.00%
   2: 0.00%
   3: 0.00%
   4: 1.53%
   5: 1.15%
   6: 1.48%
   7: 3.54%
   8: 10.67%
   9: 19.91%
   10: 21.12%
   11: 18.22%
   12: 9.94%
   13: 4.72%
   14: 2.74%
   15: 1.52%
   16: 1.14%
   17: 0.64%
   18: 0.58%
   19: 0.35%
   20: 0.26%
   21: 0.24%
   22: 0.10%
   23: 0.10%
   24: 0.05%