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?