Gemma is creating a histogram based on the table below.

salary range
number of people
0 - $19,999
40
$20,000 - $39,999
30
$40,000 - $59,999
35

which scale can she use for the vertical axis such that the difference in the heights of the bars is maximized?
a.0–50
b.0–40
c.10–50
d.25–40

the largest amount od people is 40 the lowest amount is 35

 so to maximize the bars you would want the smallest range

D. 25-40 should be the correct answer

(d)

Step-by-step explanation:

Let X represents the salary range and Y represents the Number of people.

From the table we clearly infer that the difference between the people having salary ranging $0-19,999 and the people having salary ranging $20,000-39,999 is 10,

Similarly calculating, the next difference is 5.

We can maximize the difference between the heights of the bars by choosing the scale with difference 5 on the vertical axis.

Hence (d)25-40 is  Correct.  

where's the diagrams?