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Natalie is interested in the money which people spend on textbooks. She obtained mean of $100 that has a SD of $30 in a sample

Natalie is interested in the money which people spend on textbooks. She obtained mean of $100 that has a SD of $30 in a sample of 121 students. What's her 99% CI of the mean?

A. [40.00, 160.00] B. [94.66, 105.34]

C. [95.42, 104.58] D. [92.98, 107.02]

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