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5. The yield strength (ksi) for A36 steel is normally distributed with =43 and =4.5. (a) What is
the 25th percentile of the distribution of A36 steel strength? (b) What strength value separates
the strongest 10% from the others? (c) What is the value of c such that the interval (43c, 43+c)
includes 99% of all strength values? (d) What is the probability that at most three of 15
independently selected A36 steels have strength less than 43?

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5. The yield strength (ksi) for A36 steel is normally distributed wit.pdf

  • 1. 5. The yield strength (ksi) for A36 steel is normally distributed with =43 and =4.5. (a) What is the 25th percentile of the distribution of A36 steel strength? (b) What strength value separates the strongest 10% from the others? (c) What is the value of c such that the interval (43c, 43+c) includes 99% of all strength values? (d) What is the probability that at most three of 15 independently selected A36 steels have strength less than 43?