In a numerical table with 10 rows and 10 columns, each entry is either a 9 or a 10. If the number of 9s in the nth row is $$n - 1$$ for each n from 1 to 10, what is the average (arithmetic mean) of all the numbers in the table?
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A9.45
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B9.50
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C9.55
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D9.65
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E9.70