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Density is Mass/Volume (kg/m3)

The volume of a sphere is given byV= (4/3)*pi*r3

181.8 grams = 0.1818 kg

7.15 cm = 0.0715 m

V = (4/3)*pi*(0.0715/2)3 = 1.91*10-4 m3

Therefore, Density = 0.1818/1.91*10-4 = 949.8 kg/m3

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