where average waiting time to talk to a live operator is 4 minutes, waiting times are normally distributed with a standard deviation of 0.5 minutes, and management does not want this waiting time to exceed 6 minutes), if management aspires to make this process Six Sigma, what should be the targets for the mean and standard deviation for waiting times? Reduce the standard deviation to 0.3 min (mean can stay at 4 minutes) Reduce the mean to 3 minutes (standard deviation can stay at 0.5 minutes) Reduce the mean to 2 minutes (standard deviation can stay at 0.5 minutes) Any of the above would achieve (or surpass) the Six Sigma level None of the above would achieve the Six Sigma level