Samples of the wires coming off the production line were tested for tensile strength. The statistical results (in PSI) were: Mean 500 Range 240 Standard Devaition 40 Sample Size 100 According to the Empirical Rule, the middle 95 percent of the wires tested between approximately what two values? A. 450 and 550 B. 460 and 540 C. 420 and 580 D. 380 and 620

-232

step-by-step explanation:

50.6

step-by-step explanation:

4x and 6y

im not sure though

- "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."