General electric corporate headquar

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A study of long-distance phone calls made from General Electric's corporate headquar- ters in Fairfield, Connecticut, revealed the length of the calls, in minutes, follows the nor- mal probability distribution. The mean length of time per call was 4.2 minutes and the standard deviation was 0.60 minutes. a. What fraction of the calls last between 4.2 and 5 minutes? b. What fraction of the calls last more than 5 minutes? c. What fraction of the calls last between 5 and 6 minutes? d. What fraction of the calls last between 4 and 6 minutes? e. As part of her report to the president, the director of communications would like to report the length of the longest (in duration) 4% of the calls. What is this time?

Reference no: EM131843218

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