Answer:
Average speed = 5.9 mph
RMS speed = 6.2 mph
Explanation:
The average speed is
[tex]\overline{s} = \dfrac{5+5+4+3+7+8+9}{7} = \dfrac{41}{7} = 5.9 \text{ mph}[/tex]
The rms (root-mean-square) value, as the name indicates, is the square root of the mean of the sum of the squares of the speeds.
[tex]s_\text{rms} = \sqrt{\dfrac{5^2+5^2+4^2+3^2+7^2+8^2+9^2}{7}} = \sqrt{\dfrac{269}{7}} = \sqrt{38.43} = 6.2 \text{ mph}[/tex]
