Ononot — In a 3D bubble chart, the visual area A of a bubble is propo

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Data Visualizationhard

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In a 3D bubble chart, the visual area $A$ of a bubble is proportional to the data value $z$ . If Bubble 1 has radius $r_1$ representing $z_1 = 100$ and Bubble 2 has radius $r_2 = 3r_1$ , what value $z_2$ does Bubble 2 represent?