$10 $5 $60 $20 $15 $20 $9 $2. what is the median sales value over this period?

First you have to put the numbers in numerical order: 2,5,9,10,12,20,20,60

Because they are even number, look for the 2 numbers in the middle: 10,20

Add the number: 10 + 20 = 30

Divide by 2: 30÷2

= 15

- "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."

35-60 students are taking math.