Seventy percent of service calls regarding kitchen appliances involve a minor repair. For example, the customer did not read the instructions correctly or perhaps failed to connect the appliance correctly. These service calls cost +75. Service calls for major repairs are more expensive. More than one-half of service calls for major repairs cost the customer +200 or more. What’s the probability that a randomly selected service call costs +200 or more?
Answer to relevant QuestionsSome electronic devices are better used than new: The failure rate is higher when they are new than when they are six months old. For example, half of the personal music players of a particular brand have a flaw. If the ...Among employees at a retailer, there is a 15% chance that an employee will be absent from work for some reason. The floor manager has been talking with two randomly selected employees each day to get suggestions to improve ...Recent surveys report that although Internet access has grown rapidly, it’s not universal: Only 71% of U.S. households have Internet access at home. Internet access isn’t universal for households that have computers. Of ...The lower quartile of a random variable X is the smallest q so that P(X ≤ q) ≥ 0.25. (This is analogous to the lower edge of the box in the boxplot.) What’s the lower quartile of X? A construction firm bids on a contract. It anticipates a profit of +50,000 if it gets the contract for the full project, and it estimates its profit to be +20,000 on a shared project. The firm estimates there’s a 20% ...
Post your question