(Answered) A simple random sample of 12 iphones are being sold over

Statistics

A simple random sample of 12 iphone's are being sold over the internet had the following prices.

287, 311, 262, 392, 313, 292, 337, 316, 286, 257, 258, 291

Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 63. What is the upper bound of the 95% confidence interval for the mean price for all phones of this type?

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