In [13]: Ex 9: Create a new column called performance, which is calculated by hp/wt. In [14]: head (df) Out [14]: Mazda RX4 mpg cyl disp hp drat wt qsec vs am gear carb performance 21 6 160 110 3.9 2.62 16.46 0 1 4 4 41.98473 4 38.26087 21 6 160 110 3.9 2.875 17.02 014 Mazda RX4 Wag Datsun 710 22.8 4 Hornet 4 Drive 21.4 6 Hornet Sportabout 18.7 8 108 93 3.85 2.32 18.61 1 1 4 1 258 110 3.08 3.215 19.44 1 0 3 1 360 18.1 6 225 105 2.76 3.46 175 3.15 3.44 17.02 0 0 3 2 Valiant 20.22 1 0 3 1 40.08621 34.21462 50.87209 30.34682

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