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Simple random sample of 12 tablets had battery life as follows: 287, 311, 262, 392, 313, 300, 272, 316, 286, 276, 337, 291. The population

Simple random sample of 12 tablets had battery life as follows: 287, 311, 262, 392, 313, 300, 272, 316, 286, 276, 337, 291. The population is approximately normal and the population standard deviation is 61. What is the upper bound of the 95% confidence interval for the battery life .

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