In continuous grouped data the data is collected continuously and in groups. Data collected is in class intervals the actual data values are not visible.
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If the observations are grouped together into classes, then the number of observations for each class gives the grouped frequency distribution (FD). This kind of FD is particularly important when the data are continuous so that you are likely to have very small frequencies for a very large number of values.
Non-continuous data is called discrete data.
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Grouped data.