Frequency Density

Frequency Densityvideo

Frequency density

What is frequency density?

• Frequency density is given by the formula

  • $\mathrm{frequency} \mathrm{density}=\frac{\mathrm{frequency}}{\mathrm{class} \mathrm{width}}$

• Frequency density is used with grouped data (i.e. data grouped by class intervals)

  • It is useful when the class intervals are of unequal width

  • It provides a measure of how dense data is within its class interval

    • relative to the width of the interval

How do I calculate frequency density?

• In questions it is usual to be presented with grouped data in a table

• Add two extra columns to the table

  • one to work out and write down the class width of each interval

  • the second to then work out the frequency density for each group (row)