For a symmetric distribution (where the median equals the midhinge, the average of the first and third quartiles), half the IQR equals the median absolute deviation (MAD). The median is the corresponding measure of central tendency. Identification of outliers (see below).
SLM Corporation (commonly known as Sallie Mae; originally the Student Loan Marketing Association) is a publicly traded U.S. corporation that provides consumer banking. Its nature has changed dramatically since it was set up in 1973. At first, it was a government entity that serviced federal education loans.
On April 30, 2014, Sallie Mae spun off its loan servicing operation and most of its loan portfolio into a separate, publicly traded entity called Navient Corporation. Navient is the largest servicer of federal student loans and acts as a collector on behalf of the Department of Education.