user: Question: how many series had 6.55 u.s. viewers (million) and were directed by Pete Michels
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [148.0, 1.0, '" And Then There Were Fewer "', 'Dominic Polcino', 'Cherry Chevapravatdumrong', 'September26,2010', '8ACX01/8ACX02', '9.41']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table" WHERE "U.S. viewers (million)" = '6.55' AND "Directed by" = 'Pete Michels';