6 A Home Improvement Store Carries Two Models Of Power Drills Lifetime I C Time To Failure Of Model 1 Drills Are E 1 (23.61 KiB) Viewed 36 times
6 A Home Improvement Store Carries Two Models Of Power Drills Lifetime I C Time To Failure Of Model 1 Drills Are E 2 (23.18 KiB) Viewed 36 times
6. A home improvement store carries two models of power drills. Lifetime (i.c., time to failure) of Model 1 drills are exponentially distributed with a rate of of 0.15 failures per year, whereas Model 2 drills have a lifetime that is log-normally distributed with parameters µ = 0.75 and o = 1.2.
(a) Which model of power drill is more likely to fail within 3 years? (2 points) (b) Which brand produces cables that are more likely to last at least a year? (2 points) (c) Which model of power drill has longer expected lifetime? (1 point)
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