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7 (10 points) A pilot study conducted a few months earlier indicated that the standard deviation of monthly salary for new college graduates was 1,325

7 (10 points) A pilot study conducted a few months earlier indicated that the standard deviation of monthly salary for new college graduates was 1,325 yuan. The research group wants the study's findings to be within 200 yuan of the true mean with a confidence level of 95%. What sample size is required?

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