4. Three mark exercise problems

In a village, there are $570$ people who have cell phones. An NGO survey their cell phone usage. Based on this survey a histogram is drawn. Answer the following questions.

 

 

1. How many people use the cell phone for less than $3$ hours?

 

2. How many of them use the cell phone for more than $5$ hours?

 

3. Are people using cell phone for less than $1$ hour? YesNo