A tire design has a Weibull shape parameter of 3.2. Fifty percent of the failures are estimated to occur on or before 27,000 miles. (a) Estimate when 90% of the tires will fail. (b) Determine the...

A tire design has a Weibull shape parameter of 3.2. Fifty percent of the failures are estimated to occur on or before 27,000 miles.

(a) Estimate when 90% of the tires will fail.

(b) Determine the failure mode (i.e., early-life, intrinsic, wear-out).