Mean = (Sum of values)/(Number of values)
[tex]Mean\\ \\ =\frac { 55+62+61+54+68+72+59+61+70 }{ 9 } \\ \\ =\frac { 562 }{ 9 } \\ \\ =62.4\quad mph\quad (1\quad d.p)\\ \\ [/tex]
Range = Highest Value - Lowest Value
[tex]Range\\ \\ =72-54\\ \\ =18\\ \\ [/tex]
