# Question: Armco a manufacturer of traffic light systems found that under

Armco, a manufacturer of traffic light systems, found that under accelerated-life tests, 95% of the newly developed systems lasted 3 years before failing to change signals properly. a. If a city purchased four of these systems, what is the probability all four systems would operate properly for at least 3 years?

b. Which rule of probability does this illustrate?

c. Using letters to represent the four systems, write an equation to show how you arrived at the answer to part (a).

b. Which rule of probability does this illustrate?

c. Using letters to represent the four systems, write an equation to show how you arrived at the answer to part (a).

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