The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months. a. What is the probability that a randomly selected watch will be in working condition for more than five years? b. The company has a three-year warranty period on its watches. What percentage of its watches will be in operating condition after the warranty period? c. What are the minimum and maximum life expectancies of the middle 95% of the watches? d. Ninety-five percent of the watches will have a life expectancy of at least how many months? A major department store has determined that its customers charge an average of $500 per month, with a standard deviation of $80. Assume the amounts of charges are normally distributed. a. What percentage of customers charges more than $380 per month? b. What percentage of customers charges less than $340 per month? c. What percentage of customers charges between $644 and $700 per month?
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