Here's one
And if you did a simple search before asking your question, you would have seen that it is a well documented fact.
Do your own homework before asking others to do it for you.
At least try.
[Here's one](http://www.tippingresearch.com/uploads/Waiter_Survey_Initial_Report__1_.pdf)
And if you did a [simple search](https://www.google.com/search?rlz=1C1CHZL_enCA728CA728&ei=GP0zW83IDoXQ9AOVl5jgDw&q=do+black+people+tip+well&oq=do+black+people+tip+well&gs_l=psy-ab.3...5647.13411.0.16003.11.11.0.0.0.0.164.1755.0j11.11.0....0...1.1.64.psy-ab..0.0.0....0.LRDSfgc2Kew) before asking your question, you would have seen that it is a well documented fact.
*Do your own homework before asking others to do it for you*.
At least try.
Blacks, on average, don't tip well. Blacks commit more crimes per capita. Can you blame the drivers?