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Data Visualizationmedium
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A bubble chart displays three variables: XXX on the x-axis, YYY on the y-axis, and ZZZ represented by the bubble size. If bubble A has a radius of rAr_ArA​ and represents a value ZA=150Z_A = 150ZA​=150, and bubble B has a radius of rB=3rAr_B = 3r_ArB​=3rA​, what value ZBZ_BZB​ does bubble B represent, assuming bubble size (visual area) is directly proportional to the variable ZZZ?