Just about any kind of data can be sorted into different groups. (If this does not answer the question, please reword your question and submit again.)
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No, it can be sorted either in ascending or descending order.
Charts show the data by depicting quantities of different times or different groups altogether
There is nothing that can only be sorted in ascending order - unless the sorting is being done as the data are being generated.
They are groups of data.
Yes, there can be two means in a set of data if the data is divided into two distinct groups or populations that have different characteristics. Each group would have its own mean, and the overall set of data could have a mean that is the average of the means of the two groups.