WAY1

Using the registry.xml file located in your MW_HOME directory. or  just  find  the file registry.xml

#locate registry.xml
/opt/oracle/middleware/domain-registry.xml
/opt/oracle/middleware/registry.xml
/opt/oracle/middleware/patch_wls1036/registry/patch-registry.xml

Open The file registry.xml

#cat /opt/oracle/middleware/registry.xml

you can see ann info about the versio and  the install directory
<component name=”WebLogic Server” version=”10.3.6.0″ InstallDir=””/opt/oracle/middleware/wlserver_10.3″″>

WAY2:

Using the .product.properties file located in your WLS_HOME directory.

in Linux Find it with  locate product.properties

#locate product.properties
/opt/oracle/middleware/oracle_common/.product.properties
/opt/oracle/middleware/wlserver_10.3/.product.properties

Open   the file  .product.properties

#cat /opt/oracle/middleware/wlserver_10.3/.product.properties

Fine a line similar to:
WLS_PRODUCT_VERSION=10.3.6.0

Way3

Using the Oracle Weblogic Server Administration Console
Use the left hand menu to navigate to Environment -> Servers > AdminServer(admin) . Then, click the [Monitoring] tab. You should see a screen similar to the one below:

Enjoy

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