Question

Which form of graph is more appropriate for comparing the electricity usage data of two households in relation to the number of people in each house? Electricity Consumed (units) Number of Person in a House House A House B

4	8	10
6	13	12
8	15	17
10	18	20

• A. Combined bar graph
• B. Combined histogram
• C. (a) and (b) above.
• D. Double line graph

Answer 1

The correct option is D Double line graph

Let's take an example.
The electricity usage data of two households is collected and plotted on a double line graph in relation to the number of people in each residence.
Here, it can be clearly inferred that, on average, the electricity consumption for house B is more than house A.

However, combined bar graphs or histograms are a little complicated due to the involvement of too many bars for two data sets.

$\therefore$ Correct option is (d).