The arithmetic mean (or simply the mean or average when the context is clear) is the central tendency of a collection of numbers.
I have a csv file similar to this Date,Temp1,Temp2 23-Oct-09 01:00:00,21.1,22.3 23-Oct-09 04:00:00,22.3,23.8 23-Oct-09 07:00:00,21.4,21.3 23-Oct-09 10:00:00,21.5,21.6 23-Oct-09 13:00:00,22.3,23.8 23-Oct-09 16:00:00,21.4,21.3 23-Oct-09 19:00:00,21.1,22.3 23-Oct-09 22:00:00,21.4,21.3 24-Oct-09 01:00:00,22.3,23.8 24…
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