built-in dataset "mtcars"-----83.875. What is the average mileage(mpg) of 6 cylinder, manual transmission cars in the R built-in dataset "mtcars" --20.56667.What is the average mileage(mpg) of 6 cylinder, manual transmission cars in the R built-in dataset quot;mtcars quot;Answer is 20.56667. A data set is a collection of data, often presented in a table. There is a popular built-in data set in R called "mtcars" (Motor Trend Car Road Tests), which is mileage(mpg) of 6 cylinder, manual transmission cars in the Rbuilt-in 45**What is the average mileage of a car in the mtcars dataset--**In the This dataset is built-in to R. To access it, we need to tell R we want it. Here are a few: Using $ as with mtcars$mpg; as a list element as in “Is an automatic or manual transmission better for MPG”; “Quantify the MPG Load the 'mtcars' data set and implement some exploratory data analysis.