# Redundancy Using Braun battery-powered alarm clocks, the author estimates that the probability of failure on any given day is 1/1000. (a) What is the probability that the alarm clock works for an important event? (b) When he uses two alarm clocks for important events, what is the probability that at least one of them works?

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Redundancy Using Braun battery-powered alarm clocks, the author estimates that the probability of failure on any given day is 1/1000. (a) What is the probability that the alarm clock works for an important event? (b) When he uses two alarm clocks for important events, what is the probability that at least one of them works?

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Step 1

a).

An author estimates that the probability for Braun battery-powered alarm clocks failing on any given day is 1/1,000.

Here, the probability for the alarm clock failure is 1/1,000.

Then, the probability for the alarm clock works is,

Step 2

There is a 0.999 probability that the alarm clock works for an important event.

b.

There are two alarm clocks that are used for important events.

The pro...

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