PLEASE HURRY ASAP I AM BEING TIMED - PLEASE EXPLAIN ASWELL! The frequency table below will be used to make a histogram.

Test Score
Number of Students
1 - 10
1
11 - 20
0
21 - 30
1
31 - 40
1
41 - 50
2
51 - 60
4
61 - 70
6
71 - 80
11
81 - 90
5
91 - 100
4

What is an appropriate scale and interval for this histogram?
The scale should be 0 - 10, and the interval should be 10.
The scale should be 0 - 15, and the interval should be 5.
The scale should be 1 - 10, and the interval should be 5.
The scale should be 1 - 15, and the interval should be 10.

- "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."

there are many, many solutions to this problem.

here are 5 examples:

7555531, 7+5+5+5+5+3+1 = 31

7155553, 7+1+5+5+5+5+3 = 31

7735531, 7+7+3+5+5+3+1 = 31

7375531, 7+3+7+5+5+3+1 = 31

7335931, 7+3+3+5+9+3+1 = 31

c& a manufactures treats for dogs. six samples each of five bags of treats were randomly selected and weighed, yielding