# Question

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).

## Answer to relevant Questions

Refer to the following picture.a. What is the picture called?b. What rule of probability is illustrated?c. B represents the event of choosing a family that receives welfare payments. What does P(B) 1 P(,B)equal?Which of these variables are discrete and which are continuous random variables?a. The number of new accounts established by a salesperson in a year.b. The time between customer arrivals to a bank ATM.c. The number of ...Assume a binomial distribution where n 5 3 and p 5 .60.a. Refer to Appendix B.1, and list the probabilities for values of x from 0 to 3.b. Determine the mean and standard deviation of the distribution from the general ...In a binomial distribution, n 5 8 and p 5 .30. Find the probabilities of the following events. a. x 5 2.b. x # 2 (the probability that x is equal to or less than 2).c. x $ 3 (the probability that x is equal to or greater ...In a Poisson distribution m 5 0.4.a. What is the probability that x 5 0?b. What is the probability that x . 0?Post your question

0