user: Question: How many directors directed an episode that reached 2.48 million viewers?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (in millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Pilot"', 'Lesli Linka Glatter', 'I. Marlene King', 'June8,2010', '2.47']
SQL:

assistant: SELECT COUNT("Directed by") FROM "Table" WHERE "U.S. viewers (in millions)" = '2.48';