The standard deviation σ for sampling in the case of concrete for construction engineering and management iswhere X1, X2, X3, X4, … Xn = compressive strengths of the individual cubes, N = Number of cubes tested, X̅ = Average of series of compressive strength values.

Question

The standard deviation σ for sampling in the case of concrete for construction engineering and management iswhere X1, X2, X3, X4, … Xn = compressive strengths of the individual cubes, N = Number of cubes tested, X̅ = Average of series of compressive strength values.

TuteeHUB · Accepted Answer

NA

TuteeHUB · Answer

$\sqrt {\frac{{\sum {{\left( {X + \bar X} \right)}^2}}}{{N + 1}}} $

TuteeHUB · Answer

$\sqrt {\frac{{\sum {{\left( {X - \bar X} \right)}^2}}}{{N + 1}}} $

TuteeHUB · Answer

$\sqrt {\frac{{\sum {{\left( {\bar X + X} \right)}^2}}}{{N - 1}}} $

TuteeHUB · Answer

$\sqrt {\frac{{\sum {{\left( {X - \bar X} \right)}^2}}}{{N - 1}}} $

1.	The standard deviation σ for sampling in the case of concrete for construction engineering and management iswhere X1, X2, X3, X4, … Xn = compressive strengths of the individual cubes, N = Number of cubes tested, X̅ = Average of series of compressive strength values.
A.	\(\sqrt {\frac{{\sum {{\left( {X + \bar X} \right)}^2}}}{{N + 1}}} \)
B.	\(\sqrt {\frac{{\sum {{\left( {X - \bar X} \right)}^2}}}{{N + 1}}} \)
C.	\(\sqrt {\frac{{\sum {{\left( {\bar X + X} \right)}^2}}}{{N - 1}}} \)
D.	\(\sqrt {\frac{{\sum {{\left( {X - \bar X} \right)}^2}}}{{N - 1}}} \)
Answer» E.

The standard deviation σ for sampling in the case of concrete for construction engineering and management iswhere X1, X2, X3, X4, … Xn = compressive strengths of the individual cubes, N = Number of cubes tested, X̅ = Average of series of compressive strength values.

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