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Q: As per IS 456–2000 and Clause 9.2.4.2, the assumed standard deviation for M 20 grade of concrete is:
  • A. 4.0
  • B. 3.5
  • C. 4.5
  • D. 5.5
Correct Answer: Option A - See the above explanation.
A. See the above explanation.

Explanations:

See the above explanation.