A student is investigating the terminal velocity of a spherical bead falling through a column of viscous oil. They measure the terminal velocity of the bead five times and obtain the following results:
What is the most appropriate mean value for the terminal velocity of the bead calculated from these data?
0.74 m s−10.74\text{ m s}^{-1}0.74 m s−1
0.80 m s−10.80\text{ m s}^{-1}0.80 m s−1
0.79 m s−10.79\text{ m s}^{-1}0.79 m s−1
0.64 m s−10.64\text{ m s}^{-1}0.64 m s−1