Question: How can i solve this question please 3) The yield strength of a steel reinforcing bar is lognormally distributed with mean 400 MPa and standard

How can i solve this question please

3) The yield strength of a steel reinforcing bar is lognormally distributed with mean 400 MPa and standard deviation 10 MPa. a) [5] What is the probability that the yield strength of a randomly selected reinforcing bar is less than 380 MPa? b) [5] Ten percent of the reinforcing bars have yield strength less than what amount

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