A survey of 100 businesses revealed that the mean after-tax profit was $80,000 and the standard deviation was $12,000. Determine the 99% confidence interval estimate of the mean after-tax profit. a. [77060, 82940] b. [76904, 83096] Oc. [76130, 83870] d. [77540, 82460] e. [78032, 81968]

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