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hp17
Exam1.xlsxQuestion # 885
| Question # 885. Global Airlines operates two types of jet planes: jumbo and ordinary. On jumbo jets, 25% of the passengers are on business, while on ordinary jets 30% of the passengers are on business. Of Global's air fleet, 40% of its capacity is provided on jumbo jets. (Hint: You have been given two conditional probabilities.) |
| a. What is the probability a randomly chosen business customer flying with Global is on a jumbo jet? |
| b. What is the probability a randomly chosen non-business customer flying with Global is on an ordinary jet? |
Solution # 885
Question #776.
| Question #776. On average, a certain kind of kitchen appliance requires repairs once every four years. Assume that the times between repairs are exponentially distributed. |
| a. What is the probability that the appliance will work no more than three years without requiring repairs? |
| b. What is the probability that the appliance will work at least six years without requiring repairs? |
Solution #776.
Question #694
| Question #694. A marketing firm is considering making up to three new hires. Given its specific needs, the management feels that there is a 60% chance of hiring at least two candidates. There is only a 5% chance that it will not make any hires and a 10% chance that it will make all three hires. |
| a. What is the probability that the firm will make at least one hire? |
| b. Find the expected value and the standard deviation of the number of hires. |
