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 standard deviation of these times. Make sure that you round correctly to the HUNDREDTHS place. Answers that are not rounded correctly will not be counted as correct. If the number is less than 1, make sure to put a 0 in the ones place. For example, 0.75, not .75.

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