Every year, the students at a school are given a musical aptitude test that rates them from 0 (no musical aptitude) to 5 (high musical aptitude). This year's results are given in the frequency distribution:   Aptitude Score 0 1 2 3 4 5 Frequency 1 6 4 1 5 2   Calculate the sample standard deviation of this data. Answer using two decimal places.

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