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Hi for my math...

Hi for my math problem its x=120 n=1100 and 90% is the confidence and i cant seem to figure out the lower bound of the confidence level

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I just need to find out what the lower bound of the confidence level is

**Tutor's Assistant:** Is there anything else the Math Tutor should be aware of?

Just that x=120 n=1100 and the confidence is 90%

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