# Question: Ten percent of the items produced at a plant are

Ten percent of the items produced at a plant are defective. A random sample of 20 items is selected. What is the probability that more than three items in the sample are defective? If items are selected randomly until the first defective item is encountered, how many items, on average, will have to be sampled before the first defective item is found?

## Answer to relevant Questions

Lee Iacocca volunteered to drive one of his Chryslers into a brick wall to demonstrate the effectiveness of airbags used in these cars. Airbags are known to activate at random when the car decelerates anywhere from 9 to 14 ...According to a front-page article in The Wall Street Journal, 30% of all students in American universities miss classes due to drinking.8 If 10 students are randomly chosen, what is the probability that at most 3 of them ...Find the probability that a standard normal random variable will be between -0.01 and 0.05. If X is normally distributed with mean 500 and standard deviation 20, find the probability that X will be above 555. According to global analyst Olivier Lemaigre, the average price-to-earnings ratio for companies in emerging markets is 12.5. Assume a normal distribution and a standard deviation of 2.5. If a company in emerging markets is ...Post your question