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Question
Statistical based quality control for concrete is carried out for a highway project in which 37 concrete samples were tested randomly. The average strength was found to be 40 MPa with a square of deviation of 400 (MPa)2. What is the standard deviation of the test samples?
A.
4.33 MPa
B.
3.33Mpa
C.
6.33MPa
D.
8.33MPa
Answer ( Option B)

3.33Mpa

Solution

Number of samples (n) = 37

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