user: Question: What is the average number of electorates (2009) when the district is Indore?
Columns: ['Constituency number', 'Name', 'Reserved for ( SC / ST /None)', 'District', 'Number of electorates (2009)']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['196', 'Sardarpur', 'ST', 'Dhar', 134799.0]
SQL:

assistant: SELECT AVG("Number of electorates (2009)") FROM "Table" WHERE "District" = 'Indore';