Zachary Tong a4eb1d5505 Aggregations: Add standard deviation bounds to extended_stats
Extended_stats now displays the upper and lower bounds on standard deviations (e.g. avg +/- std).
Default is to show 2 std above/below, but can be changed using the `sigma` parameter.
Accepts non-negative doubles

Closes #9356
2015-01-28 11:47:20 -05:00
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