Travis is riding with his parents on Interstate 15 across Utah. He records the digital speedometer reading in mi/h at 4:00 P.M. and every five minutes for the next hour.
His record is {61.3, 48.7, 62.4, 50.1, 60.3, 64.8, 67.1, 54.0, 60.2, 45.3, 52.3, 67.6, 63.9}
a. What is their mean speed?
b. What is the standard deviation?
c. Interpret the meaning of the standard deviation. Speculate about the traffic conditions.