A study of long-distance phones Statistics

xryrra22
timer Asked: Oct 30th, 2015

Question Description

A study of long-distance phone calls made from General Electric's corporate headquarters in Fairfield, Connecticut, revealed the length of the calls, in minutes, follows the normal probability distribution. The mean length of time per call was 5.3 minutes and the standard deviation was 0.60 minutes. What fraction of the calls last between 6 and 7 minutes?

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