It is the [arithmetic] mean.
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That's the mean ('average') of the numbers in the dataset,divided by the number of pieces of data.
The mean. Strictly, the arithmetic mean.
The mean=Adding all of the data and dividing by how much data you have.
its an geometric solid answer: You have just defined "average."
The mean of a set of data is the sum of that data divided by the number of items of data.