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φ 

 

 

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σ  1n

)x(

  2

−µ−∑

µ 

 

 

 

 

 

 

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Area covered with 3 on both side 99.9 %~σ

2.2%13.6%

34.1% 34.1%

13.6%2.2%

3 σ 3 σ

σ σ σ σ σ σ

Area = 0.95

Area = 0.05

   P  r  o   b  a   b   i   l   i   t  y   D  e  n  s   i   t  y

1.00

0-3 -2 -1 0 1 2 3

µ-3σ µ-2σ µ-σ µ µ+σ µ+2σ µ+3σ

f ck  1.65σ

µ

f c 

f c= Strength Test Value

= Mean Strength

= Standard Deviation

µ

σ

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Strength (MPa)

Test Results

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  ≥   

≥   

  ≥   ≥   

 

 

   

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≥      ≥ 

98.224

9.22232422=

+++

88.224

50.1950.2475.2475.22=

+++

96.224

1875.232.259.24=

+++