carb >= 6, mean = 335, n = 1
carb < 6, mean = 246, n = 4
drat >= 3.18, mean = 263.8, n = 5
mpg < 12.8, mean = 210, n = 2
mpg >= 12.8, mean = 170, n = 7
drat < 3.18, mean = 178.89, n = 9
cyl >= 7, mean = 209.21, n = 14
qsec < 15.98, mean = 175, n = 1
qsec >= 15.98, mean = 112.86, n = 7
mpg < 21.45, mean = 120.62, n = 8
disp >= 87.05, mean = 91.83, n = 6
disp < 87.05, mean = 62.25, n = 4
mpg >= 21.45, mean = 80, n = 10
cyl < 7, mean = 98.06, n = 18
mtcars