A zoologist collected wild lizards in the Southwestern United States. Thirty lizards from the genus Phrynosoma were placed on a treadmill and their speed measured. The recorded speed (meters/second) is the fastest time to run a half meter. (Courtesy of K. Bonine.)

1.28 1.36 1.24 2.47 1.94 2.52 2.67 1.29 1.56 2.66 2.17 1.57 2.10 2.54 1.63 2.11 2.57 1.72 0.76 1.02 1.78 0.50 1.49 1.57 1.04 1.92 1.55 1.78 1.70 1.20

(a) Construct a frequency distribution using the class intervals 0.45–0.90, 0.90–1.35, and so on, with the endpoint convention that the left endpoint is included and the right endpoint is excluded. Calculate the relative frequencies.

(b) Make a histogram.