Your company manufactures light bulbs. You know from past experience that the number of hours the bulbs will last is a normally distributed random variable, with a mean of 5,000 hours and a standard deviation of 367 hours. What percentage of the bulbs will last at least 6,000 hours?
Answer to relevant QuestionsUsing the light bulb distribution in Exercise 11 above, calculate what length-of-life guarantee your company should issue so that no more than 2.5% of light bulbs will fail to meet the guarantee. Revisit the situation first described in Develop Your Skills 4.3, Exercise 13 (page 176). A software company is about to release three new software programs, one from each of three very distinct business divisions. The first ...Which of the following is a binomial random variable? Which one(s) could possibly have a normal distribution? Explain your answers. a. The number of magazines subscribed to by a Canadian household. b. An opinion poll of ...Suppose the average credit card debt of Canadian households is normally distributed with a mean of $2,400 and a standard deviation of $756. a. What proportion of credit card debt is less than $1,000? b. What proportion of ...A construction company is bidding on a contract. The company believes that it has a 25% chance of winning the contract. If the company wins, it will earn a profit of $50,000. If the company does not win the contract, it will ...
Post your question