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A market surveyor wishes to know how many energy drinks adults drink each week. They want to construct a 80 % confidence interval for the mean and are assuming that the population standard deviation for the number of energy drinks consumed each week is 0.9. The study found that for a sample of 271 adults the mean number of energy drinks consumed per week is 7.1. Construct the desired confidence interval. Round your answers to one decimal place. AnswerHow to enter your answer fopens in new Keypad window) Keyboard Shortcuts 2 Points Lower endpoint: Upper endpoint