Histograms

Histograms

1. frequency density = frequency/class width

2. Frequency = area of the bar

3. frequency density is on the y axis

4. the median is the value where the area on both sides is equal

5. The lower quartile is the value that splits the area in to the ratio 1:3

6. The upper quartile is the value that splits the area into the ratio 3:1

7. similar to a bar chart but with continuous data only e.g. time or weight

8. the x axis has a continuous scale and there are no gaps between the bars

Images and files in the map