The ___ is the average of the sum of the squared differences of the mean from each
element in a set of numerical data.

A. variance
B. mean
C. deviation
D. normal

answer: i guess 5 units?

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."

maya’s expression will generate the wrong sum because she violated the commutative property.

step-by-step explanation:

c.

step-by-step explanation: