Depreciation is a term used for tax and accounting purposes that describes the method that a company uses to account for the declining value of its fixed assets (or tangible assets that have an estimated useful life of one year or longer).
Remember that the Verbal and Quantitative portions of the GRE have a score range between 130-170, and the average GRE score for is around 151 for Verbal and 152-153 for Quant.
For the overall GRE test-taker population, the average Verbal score is 150, the average Quant score is 152, and the average Analytical Writing score is 3.6. However, when we subdivide the test-taking population along various characteristics, we see different GRE score averages between subgroups.