The article Monte Carlo Simulation-Tool for Better Understanding of LRFD (J. of Structural Engr., 1993: 1586-1599) suggests

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The article "Monte Carlo Simulation-Tool for Better Understanding of LRFD" (J. of Structural Engr., 1993: 1586-1599) suggests that yield strength (ksi) for A36 grade steel is normally distributed with μ = 43 and σ = 4.5.
a. What is the probability that yield strength is at most 40? Greater than 60?
b. What yield strength value separates the strongest 75% from the others?
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