Cumulative Frequency Polygon Median. D Range 10 1 9 16 Cumulative Frequency. Of 261 which is 135 for Q1 we used.
However this is not exact it just provides the range. 10 4 6 120 - 140. Cumulative frequencies are easy to calculate from a frequency table.
When dealing with a cumulative frequency curve n.
As 50 of 69 is 345 we start with the cumulative frequency of 345 and find the corresponding time. For example there are 7 numbers in the example above so replace n by 7 and the median is the 7 12 th value 4th value. Jan 28 2020 Representing cumulative frequency data on a graph is the most efficient way to understand the data and derive results. Cumulative frequency graphs can then be used to estimate the median of a set of data.
