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Josh Bleecher Snyder ca19f2fc78 math/rand: fix uniform distribution stddev in tests 
The standard deviation of a uniform distribution is size / √12.
The size of the interval [0, 255] is 256, not 255.
While we're here, simplify the expression.

The tests previously passed only because the error margin was large enough.
Sample observed standard deviations while running tests:

73.7893634666819
73.9221651548294
73.8077961697150
73.9084236069471
73.8968446814785
73.8684209136244
73.9774618960282
73.9523483202549

255 / √12 == 73.6121593216772
256 / √12 == 73.9008344562721

Change-Id: I7bc6cdc11e5d098951f2f2133036f62489275979
Reviewed-on: https://go-review.googlesource.com/51310
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-08-08 23:49:00 +00:00
.github .github: add .md extension to SUPPORT file 2017-07-30 21:46:28 +00:00
api doc, api: add syscall.SysProcAttr.AmbientCaps change to 1.9 notes, API 2017-06-29 03:29:46 +00:00
doc doc: mention handling of moved GOROOT in 1.9 release notes 2017-08-04 22:14:38 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc misc/cgo/errors: update ptr.go comment 2017-08-08 04:31:40 +00:00
src math/rand: fix uniform distribution stddev in tests 2017-08-08 23:49:00 +00:00
test test: add README 2017-07-26 23:37:25 +00:00
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AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
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CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
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README.md

The Go Programming Language

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