Approximately normal and the population standard deviation


A simple random sample of 12 e-readers of a certain type had the following minutes of battery life.

287, 311,262, 392, 313, 311,316, 286,302,336,291

assumed that it is reasonable to believe that the population is approximately normal and the population standard deviation 63. what is the upper bound of the 95% confidence interval for the battery life for all e-readers of this type?

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Basic Statistics: Approximately normal and the population standard deviation
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