Therefore the median would be the 13th value. A relative frequency is a frequency divided by a count of all values. How to construct the Cumulative Frequency table for ungrouped and grouped data Data Analysis cumulative frequency tables Creating a grouped frequency table to find mean and plot a cumulative frequency graph to find the median with video lessons examples and step-by-step solutions.
When dealing with a cumulative frequency curve n is the cumulative frequency 25 in the above example.
The cumulative frequency is calculated by adding each frequency from a frequency distribution table to the sum of its predecessors. To calculate cumulative frequency we add the first frequency to the second frequency then add the third frequency to the result and the process continues. In this example for the 375 to 399 class you add its class frequency 4 to the frequency of the previous class 350 to 374 which is 6 so 64 10. Also it is useful to construct the cumulative frequencies to see how much is accumulated in terms of cumulative frequencies with respect to the total number of frequencies.