Computer · Concrete Technology
A concrete mix design for M25 grade was prepared for a highway pavement. What is the target mean strength of the concrete mix if the standard deviation of 30 samples is 4 N/mm2?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 128.4 N/mm2
- 230.4 N/mm2
- 331.4 N/mm2✓
- 426.4 N/mm2
Correct answer
31.4 N/mm2
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