1–14 Determinations of the ultimate tensile strength Sut of stainless-steel sheet (17-7PH, condition
TH 1050), in sizes from 0.016 to 0.062 in, in 197 tests combined into seven classes were
Sut (kpsi) 174 182 190 198 206 214 222
f 6 9 44 67 53 12 6
where Sut is the class midpoint and f is the class frequency. Estimate the mean and standard
deviation.