user: Question: What is the average number for Black Milk?
Columns: ['Number', 'Artist', 'Album', 'Average score', 'Number of reviews']
Types: ['real', 'text', 'text', 'real', 'text']
Sample row: [1.0, 'Scarface', 'Emeritus', 85.0, '7 reviews']
SQL:

assistant: SELECT AVG("Number") FROM "Table" WHERE "Artist" = 'Black Milk';