A 72-hour reliability test on 25 gizmos resulted in the following failure times (in hours): 10,33,36,42,55,59,61,62,65,68, and 71. Three units were removed from the test at times 15,42, and 50 to...

A 72-hour reliability test on 25 gizmos resulted in the following failure times (in hours): 10,33,36,42,55,59,61,62,65,68, and 71. Three units were removed from the test at times 15,42, and 50 to satisfy customer demands. Assuming a constant failure rate, construct a 96-percent confidence interval for

 (a) the MTTF

(b) R(lO)

(c) to.90