Sample values that are several standard deviations away from the sample average are called outliers. They are often just measurement or transcription errors, but they can bias a statistical calculation. Which of the following data are more than three sample standard deviations away from the average?

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19.4, 18.1, 25.6, 18.2, 20.6, 25.0, 21.8, 15.5, 26.3, 15.8, 18.7, 19.3, 22.3, 20.9, 24.2, 21.4, 23.2, 21.4, 47.1, 23.6, 46.3, 21.2, 27.5, 20.8, 24.7, 25.9, 25.8, 33.4, 30.9, 24.5