Longterm statistics mean value really correct?

I got some KNX temperature sensors in the house and I’d like to use the long term statistics of HA.

I have configured one of the sensors like this:

- name: "Büro Temperatur Taster Türe"
  state_address: "4/1/2"
  type: temperature
  state_class: measurement

This works nicely and I can use the statistics graph card but I can’t believe that the mean value is really correct.

This is how it looks for the last 90 days. So max/min/mean look nearly the same. Is that really correct?

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