How to limit the number of cells UITableview displays?

Im using a tableview to display some information in a quiz app that Im working on. My question is how do i make the tableview only show the number of cells that I need. Ive set the number of rows delegate method like this:

-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
   return 5;
}

but at the bottom of the table view are empty cells that are not needed. If I set the tableview style to grouped I get 5 cells and no empty ones below them. Ive seen that other people have done this but cant seem to work it out. I was wondering if they have somehow added a custom view to the table footer to cancel the empty cells out?

Any ideas or help appreciated.