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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 dis
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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 dis
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Question 862706: (Please help?)
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% 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
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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% of the batteries fall between what two values?
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Answer:
In Normal distribution, about 95.44% of all values fall within 2 standard deviations of the mean.
19 - 2(1.2) = 16.6
19 + 2(1.2) = 21.4
The answer is between 16.6 and 21.4
