One reason I can think of why you might not be able to find the mean of numerical data would be if there were missing data points.
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Mean.
The mean of a set of data is the sum of that data divided by the number of items of data.
No. Data can mean any information, text, graphics or numeric that has t be stored, used , reported on , investigated or used for reasearch
The mathematics of the collection, organization, and interpretation of numerical data, especially the analysis of population characteristics by inference from sampling.Read more: statistics
"Numerical" means "related to numbers".