A 1046 steel, water-quenched and tempered for 2 h at 1210F, has a mean tensile strength of

Question:

A 1046 steel, water-quenched and tempered for 2 h at 1210°F, has a mean tensile strength of 105 kpsi and a yield mean strength of 82 kpsi. Test data from endurance strength testing at 104-cycle life give (S′fe) 104 = W [79, 86.2, 2.60] kpsi. What are the mean, standard deviation, and coefficient of variation of (S′f e) 104?