In a survey of 15 owners of a certain model of car, the following figures for average
petrol consumption were reported.
25.5 30.3 31.1 29.6 32.4 39.4 28.9 30.0 33.3 31.4 29.5 30.5 31.7 33.0 29.2
Calculate the mean value, the median value, and the standard deviation of the data set.
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