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

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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