Nine molecules have speeds

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

Nine molecules have speeds, in

\text{ kms}^{-1}

, of 6, 9, 7, 3, 8, 5, 3, 9, 7. Which of the following is the best estimate of their rms speed, in

\text{ kms}^{-1}

? (1) 5.8 (2) 6.3 (3) 6.7 (4) 7.0