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The yield strength of a steel reinforcing bar is lognormally distributed with mean 400 MPa and standard deviation 10 MPa. a) What is the probability

The yield strength of a steel reinforcing bar is lognormally distributed with mean 400 MPa and standard deviation 10 MPa.

a) What is the probability that the yield strength of a randomly selected reinforcing bar is less than 380 MPa?

b) Ten percent of the reinforcing bars have yield strength less than what amount?

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