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Homework answers / question archive / A contractor claims that the mean compressive strength for a concrete mix is 32
A contractor claims that the mean compressive strength for a concrete mix is 32.4 Mpa and that is it has a standard deviation of 2.8 Mpa. If you break 16 cylinders and obtain a mean compressive strength of 30.3 Mpa. Would you believe the contractor's claim? Why?
