The average life expectancy of tires produced by the whitney tire company has been 40,000 miles. management believes that due to a new production process, the life expectancy of their tires has increased. in order to test the validity of their belief, the correct set of hypotheses is a. h0: μ > 40,000 ha: μ ≤ 40,000. b. h0: μ ≥ 40,000 ha: μ < 40,000. c. h0: μ < 40,000 ha: μ ≥ 40,000. d. h0: μ ≤ 40,000 ha: μ > 40,000.

addition

step-by-step explanation:

- "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."

other answer is correct. i had used the radius of the radius somehow. a website:

13cm

step-by-step explanation:

(apex)