An independent consumer testing lab preformed astatistical test on 25 type-C alk

An independent consumer testing lab preformed astatistical test on 25 type-C alkaline batteries and calculated themean life for a particular use before they failed was 22.5 hours.The distribution of the lives approximated a normal distribution.The standard deviation of the distribution was 1.1 hours.Information on the package states that the batteries should last 24hours.