An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. The distribution of the lives approximated a normal distribution. Th standard deviation of the distribution was 1.2 hours. About 95.44% of the batteries failed between what two values? Multiple Choice 14.1 and 22.1 8.9 and 18.9 12.2 and 14.2 16.6 and 21.4