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Update statistics.markdown (#15396)

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Co-authored-by: Franck Nijhof <frenck@frenck.nl>
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@ -12,10 +12,9 @@ ha_codeowners:
ha_domain: statistics
---
The `statistics` sensor platform consumes the state from other sensors. It exports the `mean` value as state and the following values as attributes: `count`, `mean`, `median`, `stdev`, `variance`, `total`, `min_value`, `max_value`, `min_age`, `max_age`, `change`, `average_change` and `change_rate`. If it's a binary sensor then only state changes are counted.
The `statistics` sensor platform consumes the state from other sensors. It exports the `mean` value as state and the following values as attributes: `count`, `mean`, `median`, `stdev`, `variance`, `total`, `min_value`, `max_value`, `min_age`, `max_age`, `change`, `average_change` and `change_rate`. If the source is a binary sensor then only state changes are counted.
If you are running the [recorder](/integrations/recorder/) component, on startup the data is read from the database. So after a restart of the platform, you will immediately have data available. If you're using the [history](/integrations/history/) component, this will automatically also start the `recorder` integration on startup.
If you are *not* running the `recorder` component, it can take time till the sensor starts to work because a couple of attributes need more than one value to do the calculation.
Assuming the [`recorder`](/integrations/recorder/) integration is running (either configured explicitly or as part of a meta-integration/dependency, e.g., [`default_config`](/integrations/default_config/), [`history`](/integrations/history/), etc.), historical sensor data is read from the database on startup and is available immediately after a restart of the platform. If the [`recorder`](/integrations/recorder/) integration is *not* running, it can take time for the sensor to start reporting data because some attribute calculations require more than one value.
## Configuration