A103647 Decimal expansion of area of the largest rectangle under the normal curve.

4, 8, 3, 9, 4, 1, 4, 4, 9, 0, 3, 8, 2, 8, 6, 6, 9, 9, 5, 9, 5, 6, 6, 0, 3, 8, 5, 8, 7, 1, 1, 2, 1, 3, 0, 9, 6, 5, 7, 3, 4, 3, 9, 4, 1, 4, 7, 4, 8, 7, 0, 0, 5, 0, 9, 7, 5, 1, 1, 0, 1, 6, 8, 5, 6, 2, 2, 0, 0, 1, 2, 7, 1, 4, 0, 1, 6, 6, 5, 8, 9, 0, 1, 6, 6, 2, 2, 5, 8, 9, 3, 8, 7, 8, 8, 4, 8, 0, 9, 4, 5, 8, 2, 7, 4

Offset: 0

Author

Robert G. Wilson v, Feb 18 2005

Keywords

• cons
• nonn

Comments

The normal curve is 'nc' = 1/(sqrt(2*Pi))*e^(-1/2*x^2). Area = 2*x*nc. d(Area)/dx = (sqrt(2/Pi) - sqrt(2/Pi)*x^2)*e^(-1/2*x^2). Maximum at x = 1.

Occurs in a formula estimating the error in approximating a binomial distribution with a Poisson distribution. See [Prohorov]. - Eric M. Schmidt, Feb 26 2014

Examples

			0.48394144903828669959566038587112130965734394147487005097511016856...
		

References

• R. E. Larson, R. P. Hostetler & B. H. Edwards, Calculus of a Single Variable, 5th Edition, D. C. Heath and Co., Lexington, MA Section 5.4 Exponential Functions: Differentiation and Integration, Exercise 61, page 351.
• Yu. V. Prohorov, Asymptotic behavior of the binomial distribution. 1961. Select. Transl. Math. Statist. and Probability, Vol. 1 pp. 87-95. Inst. Math. Statist. and Amer. Math. Soc., Providence, R.I.

Links

• Yu. V. Prohorov, Asymptotic behavior of the binomial distribution, Uspekhi Mat. Nauk, 8:3(55) (1953), 135-142 (in Russian). See lambda1 in theorem 2 p. 137.
• Eric Weisstein's World of Mathematics, Normal Distribution.

Crossrefs

Cf. A001113, A092605.

Programs

Mathematica

RealDigits[ Sqrt[2/(E*Pi)], 10, 111][[1]]

Formula

Equals sqrt(2/Pi)*e^(-1/2).