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Following are the playback time, in hours, for a sample of MP3 players. Calculate the sample standard deviation. 23, 39 , 29 , 18, 25,

Following are the playback time, in hours, for a sample of MP3 players. Calculate the sample standard deviation. 23, 39 , 29 , 18, 25, 21, 32 , 28 Write only a number as your answer. Round to two decimal places (for example: 8.32).

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