user: Question: Name the average DDR3 speed for model E-350
Columns: ['Series ^', 'Model', 'CPU clock ( MHz )', 'CPU cores', 'TDP ( W )', 'L2 cache (KiB)', 'Radeon cores', 'DDR3 speed']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'real', 'real']
Sample row: ['C-Series', 'C-30', '1000', 1.0, '0 9', '512', 80.0, 1066.0]
SQL:

assistant: SELECT AVG("DDR3 speed") FROM "Table" WHERE "Model" = 'E-350';