Question

In a double line graph, two data sets have the same -

• A. categories
• B. scale on vertical axis
• C. color indication
• D. maximum and minimum frequency

Answer 1

Answer: (A), (B)

scale on vertical axis

When two data sets have the same categories, they can be merged to form a double line graph.

Before merging two line graphs, we must ensure that the vertical axes have the same scale and unit.

To distingush the different data sets, straight lines corresponding to each data set are indicated with different colors.

The maximum and minimum values of the data sets may not be the same.
However, the scale on the vertical axis must have the maximum and minimum values out of both the data sets.

All of the above observations can be verified from the following double line graph of the number of watered plants by Harish in his school garden in two weeks:

$\therefore$ Option (a) and (b) are correct.