The gas mileages​ (in miles per​ gallon) for 30 cars are shown in the frequency distribution. Approximate the mean of the frequency distribution.   Gas Mileage                Frequency 25-28                              9 29-32                              13 33-36                                2 37-40                                  6 The approximate mean of the frequency distribution is ​(Round to one decimal place as​ needed.)

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