Results of a tensile test on SAE 1035 CD steel yieled a mean value of the ultimate strength of 86.2 ksi and a standard deviation of 3.92 ksi. If the distribution for the ultimate tensile strength is actually lognormal, what are the corresponding parameters for the normal distribution? Suppose the welbull parametes for this steel are x= 72.6 ksi, theta=87.5,and b=3.86. What is the mean value of the welbull distribution?