Maths Cumulative frequency

Maths Cumulative frequency

1. Mean, Mode and median

   • Mean. Add everything together and divide by how many there are.
   • Mode. Most frequent number
   • Median. Put numbers into order of size, then number in middle is the median.
     • If 2 numbers in the middle add them together and divide them by 2

2. Range and Interquartile range(IQR)

   • Range. Biggest number - smallest number
   • IQR more relaible,doesn't involve outliers. Measures spread
     • IQR = UQ - LQ
       • UQ and LQ is like the median of median.

3. Averages from frequency tables

4. Cumulative frequency graphs

   • Convert into table first
     • First 1 always 0 then just add one
     • Line might not finish at top of graph so median will be half of the number where the line ends on the graph
     • Can also use graph to find out other questions like how many runners ran below 13.2 seconds etc

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