What is this about? Spelling or MBA?
IMHO MBA is not that hard, come on yaar… business studies… mostly common sense. And before anyone with an MBA starts yelling at me, I have one 
and yes, it was easy peasy. I had a tougher time with 9th grade physics and chemistry, than Economics or Accounting at MBA level.
My husband’s spelling is HORRIBLE, he has an engineering degree from one of the top universities in Pakistan; he makes double of what I make and has more interpersonal skills and leadership qualities than I do… go figure.
Verdict: Intelligence cannot be gauged based on spellings and command over a language.