Per §10.4, the maximum coefficient of variation V (= σ/μ × 100) accept…

Question

Per §10.4, the maximum coefficient of variation V (= σ/μ × 100) accepted by Indian Standard for concrete is:

Accepted Answer

B. {'text': 'About 15 percent', 'label': 'B'}

1. §10.4 reads: 'As per Indian Standard the coefficient of variation should not be more than 15%.'
2. With constant V the standard deviation σ rises with strength, so higher-grade concrete tolerates a numerically larger σ at the same V.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.4, p. 8_

Answer

{'text': 'About 5 percent', 'label': 'A'}

Answer

{'text': 'About 10 percent', 'label': 'C'}

Answer

{'text': 'About 25 percent', 'label': 'D'}