BlackRock Massachusetts Tax-Exempt Trust - 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*: $9.7 Hist. Volatility: 0.96% Annual Drift: 7% Final Value*: $11.4 Percentile: 72%
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?).