Solution) A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of Johnson
Question: A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of Johnson & Shurgot Corp. indicates that the length of these calls is normally distributed with a mean of 240 seconds and a standard deviation of 40 seconds. What percentage of these calls lasted less than 180 seconds (3 minutes)?
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