Conversation so far:
when do we use pie-chart and bar graph chart model
We use Bar graphs to show numbers that are independent of each other.Pie charts are used to show you how a whole is divided into different parts.
What is an example of the Bar graph
Example of the Bar graph would be data that might include things like the number of people who preferred each of Chinese takeaways, Indian takeaways and fish and chips.

Question: What is an example of the second kind of graph
Self-contained rewrite: What is an example of the Pie chart