I would like to understand this and i would like the answer rounded to one decimal place if needed

The gas mileages (in miles per gallon) for 32 cars are shown in the frequency distribution. Approximate the mean of the Gas Mileage frequency distribution. (in miles per gallon) Frequency 30-33 11 34-37 12 38-41 4 42-45 5 The approximate mean of the frequency distribution is 36.6 (Round to one decimal place as needed.)