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This is a Java APP for Probability and Statistics Tables
...Click the link you want to download to get the Statistics Tables Windows.exe or OS X zipped files. After saving Windows file, just click the jdistabs_win.exe file to install. If you use OS X for MAC, download to the Download directory in the Finder. Then copy to the Desktop folder. Click on the jdistabs_osx.zip to unzip. In the jdistabs_osx folder that is created, create an alias file from the jdistabs_osx.jar file and drag it to the Desktop. Click the Desktop file to start the program.
This tool, described in the July 2006 issue of IEEE Computer, determines how many servers to install such that average request response time is 'x' number of seconds. The tool is a Java application that is used for server sizing efforts.