Extroverts remind me of the kids who were really loud in school and had a hard time sitting down and working on a project. They were often the ones that had to be told by the teacher to sit down and do their class work. Little did they know they would be preferred in the workforce when they're adults...
If you think about it, being quiet is rewarded in school when we're growing up. Focusing on your work and not talking to the people next to you became a classroom rule. You got a gold star for being quiet, focused, paying attention, etc...
If you didn't stop talking and focus on the task at hand, you were reprimanded, told to be quiet and sit down, stop talking to Betsy or Joey or whoever else, and if you didn't listen you were dragged to the principles office.

In adulthood its almost the complete opposite. I just realized this as I'm typing this. They totally teach you how to be one way when you're in school, and then when you're in college or beyond they expect you to be the opposite and "getting up and socializing" is preferred in the workplace.