$2.5 \ g/cm^3$
Work Step by Step
Volume of water before the marbles are added: 61 mL Volume of water after the marbles were added: 95 mL Marbles' volume: 38 mL Marbles' mass: 95.2 g The density is: $\rho=95.2\div38=2.5\ g/cm^3$
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