Question

percentage of dwellings with electricity
what percentage of all dwellings had electricity in 1922?
28%
40%
52%
65%

Explanation:

Step1: Locate 1922 on the x - axis

Find the year 1922 on the horizontal axis of the graph.

Step2: Read the corresponding y - value

Move vertically from 1922 on the x - axis to the curve and then horizontally to the y - axis. The value on the y - axis is 40.

Answer:

40%