Which of the following statement is TRUE about a z-score? Choose the correct answer below. A. Z-scores have a mean of 0 and a standard deviation of 1. B. A z-score is a measure of how extreme or typical a data value is. C. A z-score tells us how many standard deviations a value is from the mean. D. Z-scores standardize a dataset.

- "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."

what is

step-by-step explanation:

2 apples

step-by-step explanation:

taking away equals subtraction. 6-4=2