No idea how they do it at Ole Miss, but in general, here's what the MOI has to say:
Quote:
Automatically Adjusting Total (2013)
To allow groups to achieve parity as quickly as possible at the conclusion of primary recruitment, total will be automatically adjusted annually no later than 72 hours following bid distribution. The adjustment will be to average chapter size unless the College Panhellenic adopts an acceptable alternative formula according to the Manual of Information.
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Quote:
Options in Determining Total (2009)
Panhellenics will review total annually, and if it is determined total should be revised, after consultation with the NPC area advisor, College Panhellenics can vote to determine total by any one of the following: 1) average chapter size; 2) the median chapter size; 3) the size of the largest chapter and combined with a number that reflects the best adjustment to total to ensure continued growth opportunities, parity, housing obligations, availability of campus facility and vitality of the College Panhellenic community. Campuses with deferred recruitment may review total to allow for a fall recruitment that would assist in establishing parity, using either average chapter or median size, allowing those below the number to recruit upperclass members.
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In other words, the norm is to use the mean, but PHAs have other options that they may vote to use.