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>