Question

Consider the following double line graph of the number of watered plants by Harish in his school garden in two weeks.


Choose the correct option regarding the double line graph.

• A. Harish was more consistent in watering plants in the $1^{st}$ week than the $2^{nd}$ week.
• B. Harish was more consistent in watering plants in the $2^{nd}$ week than the $1^{st}$ week.
• C. It is impossible to interpret any such conclusion using the given representation.

Answer 1

The correct option is B Harish was more consistent in watering plants in the $2^{nd}$ week than the $1^{st}$ week.

A double line graph is used to compare two data sets of same categories. It is a combination of two line graphs plotted on same scale.

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

In the given plot, the line graph corresponding to the number of watered plants by Harish in $1^{st}$ week is indicated by purple color, while the data for $2^{nd}$ week is indicated by green color.

Here, the number of watered plants in the $2^{nd}$ week lies between $6$ to $8$, whereas for $1^{st}$ week it is between $0$ to $10$.

The difference between the maximum and minimum number of watered plants in $2^{nd}$ week is $8-6=2.$

The difference between the maximum and minimum number of watered plants in $1^{st}$ week is $10-0=10.$

The mentioned difference is less in case of $2^{nd}$ week.

Hence, we can interpret that Harish was more consistent in watering plants in the $2^{nd}$ week than the $1^{st}$ week because

$\therefore$ Option (b) is correct.