You have an interesting candidacy. I want to mention that because you have a high volume of job changes on your resume, it may be a good idea, in your application, to explain the reason for your changes and help the admissions committee to understand the motivation behind your decisions. You don't want to appear to lack commitment or be unfocused to an admissions team.
It’s important in this situation to refrain from merely chronicling your resume. You will want to explain the “WHY?” behind the “WHAT you did.” There is no right number of jobs, or right number of years at a job. Most important is to explain why each step is a logical one in your path to the MBA and longer term goals. If there was a misstep somewhere, you can explain what happened, how you corrected course and what you learned. This can also add important dimension to your application.
Hope this was of help.
Conrad and the Stacy Blackman
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap