12 A survey of the speed of 700 cars on an expressway is shown below. km/h Speed x km/h Centre x frequency 130 120 50
12 A survey of the speed of 700 cars on an expressway is shown below. km/h Speed x km/h Centre x frequency 130 120 50 sum = 700 The graph below shows the 4 points and the (quadratic) line of best fit. 350 300 y = -0.25x2 + 44.5x - 1680 R2 = 0.9529 250 200 150 100 50 + .. ........... . . . . . .... 20 40 60 80 100 120 140 -50 speed
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