A researcher conducts a mileage economy test involving 88 cars. The frequency distribution describing average miles per gallon (mpg) appears in the following table. a-1. Construct the relative frequency distribution. Note: Round "Relative Frequency" to 4 decimal places. a.2. What proportion of the cars got at least 20 mpg but less than 25mpg ? Note: Round your answer to 4 decimal places. a-2. What proportion of the cars got at least 20mpg but less than 25mpg ? Note: Round your answer to 4 decimal places. a-3. What proportion of the cars got less than 40mpg ? Note: Round your answer to 4 decimal places. a-4. What proportion of the cars got 40mpg or more? Note: Round your answer to 4 decimal places. b. Which statement is correct regarding the shape of the distribution using a histogram? The distribution is symmetric. The distribution is not symmetric