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Grade-point averages are scaled between 0-6. How many grade point averages must be obtained so that the sample mean is within .007 of the population

Grade-point averages are scaled between 0-6. How many grade point averages must be obtained so that the sample mean is within .007 of the population mean? 98% is confidence level, (range/4)=(6-0/4)=1.5. What is a required sample size?

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