No. Labels are normally text. Numbers are usually referred to as values. Occasionally a number could be a label. Even then, they would often be formatted as text.
labels or cell content
COUNT
The name of the series, the values in the series and the category labels.
You would see the label XX =c20 on labels for the numeric math other wise the excel function that you would use would be BIOGRADBLE x 20-
To divide the sum of a data set by the number of values is called the "mean" function of the data set. It is called the AVERAGE function in Excel.
label
There is no single answer. Often it can be a label, which may be the answer you are looking for, but text values used in Excel are not always labels. If you have a list of names in a spreadsheet, the names are not labels. There may be a label at the top like "Names", but the names themselves are not labels.
The AVERAGE function.
In Excel is it COUNT.
Their formatting. You can set many different formats for cells, like different number types or different fonts or different colours for the cell or the contents.
comparison operators
A legend is used on a chart to identify the series on the chart, such as the particular bars or lines, so the user know what each one represents. Labels are headings on the worksheet itself, or can be data labels which show the actual values on a chart.