Review Request 19368: ACCUMULO-2494 Fix calcualtion of stdev

[Mike Drob]

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Review request for accumulo.


Bugs: ACCUMULO-2494
    https://issues.apache.org/jira/browse/ACCUMULO-2494


Repository: accumulo


Description
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ACCUMULO-2494 Fix calcualtion of stdev


Diffs
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  core/src/main/java/org/apache/accumulo/core/util/Stat.java 
e65265c6decde47ef229377653112a677fef8112 
  core/src/test/java/org/apache/accumulo/core/util/StatTest.java PRE-CREATION 

Diff: https://reviews.apache.org/r/19368/diff/


Testing
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Unit tests results compared with calculations from Wolfram Alpha.


Thanks,

Mike Drob