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QUESTION 31 Discussion file #11 We are trying to estimate the mean medical bill at Scott & While for heart surgery. A sample of 40 patient bills were taken, resulting in the following 95% Cl on the mean; ($88,000 , $92,000) If that CI is too narrow, what should the approximate sample size have been if we had wanted the boundaries to be at most $2250 from the mean? O a. 1801 O b. 256 O c. 70 O d. 32 Oe. 1800.3