Continuation of Exercise 4-85. (a) If 10 assemblies are tested, what is the probability that at least

Question:

Continuation of Exercise 4-85.
(a) If 10 assemblies are tested, what is the probability that at least one fails in less than 100 hours? Assume that the assemblies fail independently.
(b) If 10 assemblies are tested, what is the probability that all have failed by 800 hours? Assume the assemblies fail independently.