1003029508

There were the following speeds of six cars recorded on one of the roads in New York: $66\mathrm{mph}$, $57\mathrm{mph}$, $71\mathrm{mph}$, $54\mathrm{mph}$, $69\mathrm{mph}$, $58\mathrm{mph}$. We would like to know the average of these recorded speeds. What type of average do we need to use?