The average time between accidents in a factory is 11 weeks. Find the probability that more than 25 weeks pass between accidents.

A drug test correctly gives a positive result 88 percent of the time. However, 3 percent of the time, it incorrectly gives a positive result. This is known as a false positive. Suppose that 5 percent of the people to be tested will have one or more of the drugs being tested for in their system. What is the probability that a randomly chosen person will have get a positive test result? Your answer should be to 4 decimal places.

A courier service makes an average of 500 deliveries a week, plus / minus 50. The manager wants to know the probability that, on average, between 490 and 510 deliveries will be made during the next 30 weeks. Write your answer to 5 decimal places.

According to the Turkish Ministry of Health, the probability of a woman developing breast cancer over a lifetime period is 1/5. What is the probability that 3 women out of 15 will develop breast cancer over a lifetime?