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The true mean typing speed of Exdata's 10,000 employees is normally distributed with a population mean of 20 and a population standard deviation of 6.

The true mean typing speed of Exdata's 10,000 employees is normally distributed with a population mean of 20 and a population standard deviation of 6.

How many employees must Exdata sample in order to have a 50% chance that the sample mean will be within 1 wrd per minute of the population mean typing speed of all 10,000 employees?

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