Creating Histograms

There is no need to create the frequency table before drawing the histogram. It is quicker to put the data directly onto the chart:

• create an empty chart with the appropriate bins
• work through the table of data values putting an 'X' in the appropriate bin. Equispace the crosses so that they form the bars

If you need a frequency table you can create it from the histogram:

	The data show the wait times, in minutes, for 50 admissions into the casualty department of a hospital: 24 22 24 30 24 16 18 32 27 69 26 36 41 27 43 29 26 21 39 44 25 32 30 28 26 34 21 30 30 31 32 37 64 26 68 20 32 43 31 24 20 27 30 33 39 40 22 31 29 43 spreadsheet Draw a histogram and comment on the results. What action would you suggest?