A simple random sample of 12 e-readers of a certain type had thefollowing minutes of battery life. 287, 311, 262, 392, 313, 260,320, 316, 286, 256, 303, 291 Assume that it is reasonable tobelieve that the population is approximately normal and thepopulation standard deviation is 76. What is the upper bound of the95% confidence interval for the battery life for all e-readers ofthis type? Round your answer to one decimal places (for example:319.4). Write only a number as your answer. Do not write anyunits.
