Finding Quartiles from Grouped Frequency Tables

The spreadsheet view shows data for a grouped frequency table. Change values as you wish. -99 is a piece of data not included in the diagram. DO NOT DELETE VALUES but instead replace them with -99 if you wish. Use the sliders in the graphics view to show quartiles 1, 2 and 3 (or none). The item number slider is used to highlight each counter in the diagram in turn - useful for counting through the values. The cumulative frequency slider shows progressive elements of the cumulate frequency column. The check box is used to hide counters (and show them) as you wish.
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