# Civil Engineering - Concrete Technology - Discussion

### Discussion :: Concrete Technology - Section 4 (Q.No.39)

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%

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.