quot;On holdquot; times for callers to a local cable television company are known to be normally distributed with a standard deviation of 1.3…

“On hold” times for callers to a local cable television company are known to be normally distributed with a standard deviation of 1.3 minutes. Find the average caller “on hold” time if the company maintains that no more than 11% of callers wait more than 5.7 minutes. (Give your answer correct to two decimal places.)

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