Census data for a certain county were used to construct the following frequency distribution for commute time (in minutes) of working adults. Commute Time Relative Frequency 0 to <5 0.0509 5 to <10 0.1848 10 to <15 0.1968 15 to <20 0.1538 20 to <25 0.1389 25 to <30 0.0549 30 to <35 0.1019 35 to <40 0.0190 40 to <45 0.0190 45 to <60 0.0390 60 to <90 0.0200 90 to <120 0.0210 (a) Notice that not all intervals in the frequency distribution are equal in width. Why do you think that unequal width intervals were used

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

answer: the answer is ann