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A178647
Decimal expansion of the fraction of a population falling within +- 1 standard deviation of the mean, assuming a normal distribution.
8
6, 8, 2, 6, 8, 9, 4, 9, 2, 1, 3, 7, 0, 8, 5, 8, 9, 7, 1, 7, 0, 4, 6, 5, 0, 9, 1, 2, 6, 4, 0, 7, 5, 8, 4, 4, 9, 5, 5, 8, 2, 5, 9, 3, 3, 4, 5, 3, 2, 0, 8, 7, 8, 1, 9, 7, 4, 7, 8, 8, 9, 0, 0, 4, 8, 5, 9, 8, 2, 8, 8, 3, 9, 7, 4, 4, 0, 9, 6, 5, 9, 0, 0, 1, 7, 6, 9, 8, 3, 6, 8, 1, 1, 2, 7, 8, 6, 5, 5, 0, 5, 6, 5, 4, 5
OFFSET
0,1
LINKS
Eric Weisstein's World of Mathematics, Erf
Wikipedia, 68-95-99.7 rule
FORMULA
erf(1/sqrt(2)). - Jean-François Alcover, May 29 2013
EXAMPLE
0.6826894921370858971704650912640758449558259334532087819747889004859...
MAPLE
erf(1/sqrt(2)) ; evalf(%) ; # R. J. Mathar, Mar 22 2016
MATHEMATICA
RealDigits[(1 + Erf[1/Sqrt@2])/2 - (1 + Erf[ -1/Sqrt@2])/2, 10, 111][[1]] (* Robert G. Wilson v, Jun 01 2010 *)
PROG
(MATLAB) 0.5*(1+erf(1/sqrt(2)))- 0.5*(1+erf(-1/sqrt(2)))
(PARI) (erfc(-1/sqrt(2))-erfc(1/sqrt(2)))/2 \\ Charles R Greathouse IV, Sep 04 2012
(PARI) 1 - erfc(1/sqrt(2)) \\ Rick L. Shepherd, Mar 05 2014
CROSSREFS
Cf. A110894 (2sigma), A270712 (3sigma).
Sequence in context: A362976 A154564 A152914 * A093204 A365823 A054512
KEYWORD
nonn,cons
AUTHOR
Joost de Winter, May 31 2010
EXTENSIONS
More terms from Robert G. Wilson v, Jun 01 2010
Edited by N. J. A. Sloane, Jun 07 2010
STATUS
approved