Question

In which age students do have the least number of mobile phones?

$A.11$
$B.12$
$C.13$
$D.14$

Answer 1

From the question, we need to find the age of the students who have the least number of mobile phones. We shall analyse the diagram minutely to find out the required information.

Complete step-by-step solution:
For the given question, we can see, the ages of students are plotted on the x axis and the number of students is plotted on the y axis. The ages that are plotted on the x axis are $11,12,13,14,15,16.$
The numbers of students are $10,20,30,40,50,60.$
The purple line represents the trend of having mobile phones to the number of students in particular age groups.
For the age group of $11$, the number of students who have mobile phone is $20$
For the age group of $12$, the number of students who have mobile phone is $10$
For the age group of $13$, the number of students who have mobile phone is in between$1{\text{0 to 20}}{\text{.}}$
For the age group of $14$, the number of students who have mobile phone is in between ${\text{20 to 30}}{\text{.}}$
For the age group of $1{\text{5}}$, the number of students who have mobile phone is in between ${\text{40 to 50}}{\text{.}}$
For the age group of $16$, the number of students who have mobile phone is $50.$
The line is falling from the age group of $1{\text{1}}$ to the age group of $12$, and rising from $12$ to $16$. After$16$, it is again falling.
Thus, for the given diagram, the lowest point is $10$ which is at $12$.

Hence the correct option is B which is $12$

Note: A linear diagram helps to analyse the trend of a dataset minutely. Here, the line graph shows the trend of having mobile phones among the students of different age groups. It is an easy way to comprehend any data.