Continuous Data
Work with continuous grouped data using class intervals, midpoints, histograms and cumulative frequency.
Continuous data toolkit
- Use class intervals for measured quantities such as height, mass or time.
- Use midpoints to estimate the mean from grouped data.
- Use histograms when class widths may differ.
- Use cumulative frequency graphs for medians and percentiles.
Estimated mean
\[\bar x\approx\frac{\sum f x}{\sum f}\]
Here \(x\) is the class midpoint and \(f\) is the class frequency.