SLM Corporation - 6% Senior Notes due December 15, 2043 - 2011  (Inactive Symbol)

The following graph plots the year-to-date performance of the stock for 2011 compared to the probability calculated by a random walk model.

Initial Value*: $13.8 Hist. Volatility: 1.5% Annual Drift: 7% Final Value*: $13.8 Percentile: 45%
Click on the image for the high resolution version.

The high to date and low to date prices of the stock plotted against a random walk model for 2011 (what's this?).