Hi,
You can look at some basic statistics in the layers properties by right
clicking on the layers. Those are sometimes wrong. Best to use the
gdal raster statistics in the processing toolbox plugins or the grass module in
the same toolbox.
The gdal module in the raster\ menu can sometimes give wrong results if the
.XML file has been created. If you delete it, if will give you good
results. The XML file with the statistics is created if you open and
close a layer for the first time. Look in same directory as your raster
to find and delete the file. Depends on the version Qgis. Bug
may have been fixed.
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca
Le 2015-03-19 06:56, "Md.Azizul Haque [via OSGeo.org] "
<[email protected]> a écrit :
Dear QGIS Users, I need to compute cell statistice from a raster by
QGIS. Would you be kind enough to help me ? Thanks and regards Azizul
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