The target mean strength of the M-20 grade concrete is 27N/mm2, what is the value of standard deviation?

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VideRime Staff asked 3 years ago
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The target mean strength of the M-20 grade concrete is N/mm2, what is the value of standard deviation?

a) 2.01

b) 3.5

c) 4.24  (Ans)

d) 5