1. What is the difference between a histogram and a bar (column) graph?
Histograms are used for continuous data such as frequencies of people of a range of heights or weights.
Bar graphs are used for discrete data such as the frequencies of the number of cars of a certain colour.
In a bar graph, the bars are usually not touching. In a histogram the bars always touch.
2. Can a pie graph be used for all types of data?
No. Pie graphs or charts are most suitable to data where proportions or percentages of a total amount are available .
3. How can the pictures in pictographs be turned into data?
Each picture represents a certain number of items.