Civil Engineering - Concrete Technology - Discussion

39. 

If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is

[A]. 10%
[B]. 12.5%
[C]. 15%
[D]. 18.5 %
[E]. 20%

Answer: Option B

Explanation:

No answer description available for this question.

Civil said: (Dec 11, 2013)  
Co-efficient of variation:

500/4000 = .125*100 = 12.5.

Ruhi Varshney said: (Jan 26, 2016)  
Coefficient of variation = Standard deviation/Average strength.

Samm said: (Nov 8, 2016)  
ft = fck + kS where k = 1.65 and S = standard deviation . And as per the question 4000 kg/cm2 is equal to M400 conc that is not usually possible it should be 400 kg/cm2 and so does in case of standard deviation it should be 50 instead of 500 so the variation should be 1.25 * 500/4000 = 15.625%.

Sukan said: (Dec 12, 2016)  
Coefficient of Variance is the percentage ratio of standard deviation to the mean.
Hence 12.5% is the answer.

Dhanu said: (Sep 8, 2017)  
Co-eff of variation = (std deviation / avg strength )*100.
500/4000 = 0.125 *100 = 12.5 %.
source : M.S shetty.

Priya said: (Nov 9, 2017)  
Coefficient of variation = standard/mean*10.

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