id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1315480779,I_kwDOAMm_X85OaKTL,6817,wrong mean of complex values,2448579,closed,0,,,1,2022-07-22T23:09:47Z,2022-07-23T02:03:11Z,2022-07-23T02:03:11Z,MEMBER,,,,"### What happened?

Seen in #4972 

``` python
import xarray as xr
import numpy as np

array = np.array([0. +0.j, 0.+np.nan * 1j], dtype=np.complex64)
var = xr.Variable(""x"", array)
print(var.mean().data)
print(array.mean())
```

```
0j
(nan+nanj)
```

### What did you expect to happen?

_No response_

### Minimal Complete Verifiable Example

_No response_

### MVCE confirmation

- [ ] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
- [ ] Complete example — the example is self-contained, including all data and the text of any traceback.
- [ ] Verifiable example — the example copy & pastes into an IPython prompt or [Binder notebook](https://mybinder.org/v2/gh/pydata/xarray/main?urlpath=lab/tree/doc/examples/blank_template.ipynb), returning the result.
- [ ] New issue — a search of GitHub Issues suggests this is not a duplicate.

### Relevant log output

_No response_

### Anything else we need to know?

_No response_

### Environment

<details>



</details>
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