**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

alwaystouch.

**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.