To use the MEAN Function
MEAN(Tag1,Tag2,Tag3)
The mean is found by adding up all of the given data and dividing by the number of data entries. (Giving you the average)
Tag1 + Tag2 + Tag3 / 3
MEAN(Demo-influxdb/DEMO_01TI031.PV,Demo-influxdb/DEMO_01TI032.PV,Demo-influxdb/DEMO_01TI021.PV)
