I am horrible in math but I'm interested in a business major, specifically marketing. How much math is involved in marketing and what is the least math intensive business major? Thanks.

There is math in marketing and pretty much every business program. You are mostly looking at statistics. It is important to be able to interpret research results and you need stats to do that. A lot of computer programs can do the work but you still need to understand it so you can apply the results properly to your research. In my program we were required to take stats courses where you unfortunately don't get to use the computer and have to do calculations by hand. You will also need basic algebra when determining finances and costs for any business program. Probably the least math intensive major would be Human Resources which you don't need stats (depending on the school) but you still will have to do financial calculations.