# Relative Frequency Pareto Chart

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A relative frequency pareto chart consists of two graphs – a bar graph showing frequencies and a line graph showing cumulative frequencies (in percentages) over it.

We now explain how to construct a relative frequency pareto chart by means of an example.

### Steps to construct a Pareto chart:

1. Given the frequency table, calculate the cumulative frequencies by adding the current and previous frequencies.
2. Convert the cumulative frequencies to percentage, by first dividing with the total frequency and then multiplying by 100.
3. Plot the frequencies using a bar graph.
4. Plot the cumulative percentages and join them by straight lines.

### Example:

Suppose we are given the following data on factors influencing purchase decisions vs the number of customers.

Step 1: We first find the cumulative frequencies by adding up the current and previous frequencies.

Step 2: We convert the cumulative percentage by dividing cumulative frequency by total frequency and multiplying by 100.

Step 3: We plot the frequencies using a bar graph and plot the cumulative percentages using a line graph. We obtain the relative frequency pareto chart as shown below.