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(6 points) a) For 30 randomly selected Rolling Stones concerts, the mean gross earnings is 2.89 million dollars. Assuming a population standard deviation gross earnings

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(6 points) a) For 30 randomly selected Rolling Stones concerts, the mean gross earnings is 2.89 million dollars. Assuming a population standard deviation gross earnings of 0.48 million dollars, obtain a 99% confidence interval for the mean gross earnings of all Rolling Stones concerts (in millions). Confidence interval: ( b) Which the following

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