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Assume the strength of a batch of concrete cubes (1200 samples in total) is normally distributed with mean of 46 MPa and standard deviation of

Assume the strength of a batch of concrete cubes (1200 samples in total) is normally distributed with mean of 46 MPa and standard deviation of 3.5 MPa, calculate:

(a) How many samples have a strength of less than 37 MPa?

(b) How many samples have strength values falling between 42 MPa and 50 MPa? [

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