Are you serving the same page for both /MBA and /mba? You should set up a 301 redirect from one to the other.
In Analytics, you can set a custom filter to make your URLs case insensitive, but I don't believe that'll fix the data currently in your account, it'll only fix them going forward. That process is outlined here: http://support.google.com/googleanalytics/bin/answer.py?hl=en&answer=90397.
My URLs are all lowercased so I can't actually find an example in my account to test, but when I do an advenced filter and select Include Page with the match type of "Matching RegExp" and try URLs with uppercase characters, Analytics appears to be making the query case insensitive. So you can try that as well.
If the prior paragraph didn't work for you, you can do this on a URL by URL basis, by doing an advanced search by regular expression and substituting in "[M|m][B|b][A|a]" for "mba".