I think the other answers posted so far are neglecting something important about the word "majority", which is that it doesn't always indicate a collection (or a collective for that matter). There are of course many times when it does, and in those times, you must use a plural verb (because "the majority" is countable and plural). However, there is a second context in which the expression "the majority" may appear which indicates the larger or largest part of a whole. In those cases, you use the singular verb.
Here are some valid examples:
- The majority of cars on the street are white.
The plural is used because "most" means the a countable number of cars, all of which are white.
- The majority of cars run on gasoline.
The plural is used because "most" indicates a countable number of cars.
And here are some valid examples of using the singular:
- The majority of the pie is burnt.
The singular is used because "most" indicates the largest part or portion of a single thing.
- The majority of the fence needs repair.
The singular is used because here again, "most" indicates the largest part or portion of a single thing.