The times listed are the top twelve prelim times for the 100 Backstroke at a regional meet. 53.61, 53.93, 55.12, 55.44, 55.62, 56.16, 56.30, 56.40, 56.51, 56.69, 57.13, 57.18 Find the mean of these times. Round your answer to the THOUSANDTHS place.

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