Statiscal Data

Bar Graphs - 

Picture
 Bar Chart
A bar chart is a chart where the height of bars represents the frequency. The data is 'discrete' (discontinuous- unlike histograms where the data is continuous). The bars should be separated by small gaps.



Pie Charts -

A pie chart is a circle which is divided into a number of parts.
Picture
 The pie chart above shows the TV viewing figures for the following TV programmes:
  • Eastenders, 15 million
  • Casualty, 10 million
  • Peak Practice, 5 million
  • The Bill, 8 million
Total number of viewers for the four programmes is 38 million. To work out the angle that 'Eastenders' will have in the pie chart, we divide 15 by 38 and multiply by 360 (degrees). This is 142 degrees. So 142 degrees of the circle represents Eastenders. Similarly, 95 degrees of the circle is Casualty, 47 degrees is Peak Practice and the remaining 76 degrees is The Bill.