Out of 400 students sampled, 300 of them said that they hoped to have children someday. with 95% confidence, what is the approximate percentage of the students in the population who hope to have children someday? a. 68.5% to 81.5% b. 70.7% to 79.3% c. 72.8% to 77.2% d. 66.3% to 83.7%

- "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."