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. The standard deviation of the distribution was 1.2 hours. About 95.44 percent of the batteries failed between what two values?
8.9 and 18.9
12.2 and 14.2
14.1 and 22.1
16.6 and 21.4© BrainMass Inc. brainmass.com June 3, 2020, 6:56 pm ad1c9bdddf
The correct answer is "16.6 and 21.4"
In a normal distribution, about 95% ...
The explanation leads to the correct answer to the question.