Generate statistics when multiple objects are selected

[naoliv]

Could the measurement plugin generate some statistics when multiple objects are selected?
For example, when > 1 areas are selected, it could display the average area size.

JOSM

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2015-05-20 01:32:12
Last Changed Author: Don-vip
Revision: 8401
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Relative URL: ^/trunk
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2015-05-20 02:46:51 +0200 (Wed, 20 May 2015)
Last Changed Rev: 8401

Identification: JOSM/1.5 (8401 pt_BR) Linux Debian GNU/Linux testing (stretch)
Memory Usage: 280 MB / 10206 MB (106 MB allocated, but free)
Java version: 1.7.0_75, Oracle Corporation, OpenJDK 64-Bit Server VM
Java package: openjdk-7-jre:amd64-7u75-2.5.4-2
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
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- OpeningHoursEditor (30962)
- PicLayer (31114)
- SimplifyArea (30962)
- buildings_tools (31120)
- conflation (0.1.7)
- contourmerge (1013)
- download_along (30892)
- editgpx (30892)
- geotools (31068)
- importvec (30892)
- jts (31002)
- log4j (30892)
- measurement (30892)
- merge-overlap (30988)
- opendata (31116)
- pbf (31010)
- pdfimport (30892)
- poly (31056)
- reverter (31120)
- scripting (30710)
- todo (29154)
- turnrestrictions (31034)
- undelete (30892)
- utilsplugin2 (31120)